ReadWriteWeb

The Gmail team has announced the introduction of multiple sign-in, a badly needed feature in the mobile Web version. Users can now sign into multiple Gmail accounts at once through the mobile Web interface and use a pop-up menu at the bottom of the screen to easily switch between them.

Different accounts also have different URLs, so users can bookmark their inboxes separately and add them to the home screen. The announcement also includes mobile-specific signatures and vacation auto-responder settings. Previously, messages from mobile Gmail had no signatures.

Wikipedia pushed a new mobile interface live today and though end-users probably won't be able to tell the difference (except the new Beta label) - it's the start of something big. The new mobile front end framework that's been pushed live, called MobileFrontend, replaces an older less agile front end for the mobile site and aims to enable a host of new developments.

First, the new mobile front end will be deployed across all the Wikipedia sister sites and projects, right now it's just Wikipedia that has a specially formatted mobile interface. Next, this new front end will support forthcoming mobile developments like mobile editing, image uploading from mobile devices and offline support for Wikipedia on your phone. Those sound like great directions for Wikipedia mobile to go. Mobile has long felt like a second class citizen, but perhaps that will change soon.

Grindr, the popular gay hookup mobile app, has launched a new version of its location-based people-finding service. Called Blendr, the app is aimed at a general audience, but the core idea remains the same: help users find other users based on shared interests and physical proximity, as close as one block away.

Unlike Sonar or Foursquare, where you have to go outside the app to Twitter to talk to people or leave time-delayed comments on check-ins, Blendr keeps your interaction with nearby people in the same app.

Dropbox, darling of the cloud-powered file-sharing space, has given its mobile website a significant facelift. The new site, which was designed by one of the company's interns, now looks and feels more like a native mobile application.

The new mobile-optimized layout is very similar to that of Dropbox's native apps for iOS and Android, except that it of course works across platforms, including Windows Phone 7, Android and iPhone. It displays nicely on the iPad as well, but doesn't quite compare to Dropbox's native iPad app, which is specifically optimized for the tablet.

Israeli mobile chat startup fring has just taken a swing at Google Plus with Playgrounds, a group video chat tool for iOS and Android devices. Playgrounds are four-way open video chat discussions organized around topics. Users can browse open Playgrounds or create their own.

Sounds like a four-person Hangout, doesn't it? But the Google Plus open video chat service is still confined to the desktop. Fring keeps pushing mobile video chat forward, and the giants are slow to react.

Breezy, a mobile printing startup, recently launched a version of its app for the iPhone.

Once installed, the app lets you print documents and other files from your iOS device, whether to a printer at your home, office or a public location. The application comes equipped with a feature that uses GPS to find nearby public printers, many of whom have partnered with Breezy.

I'm thousands of feet in the air, speeding across the United States, flying from Portland, Oregon to Austin, Texas. When I land, I'm going to send a picture of myself to my nieces back home - but it won't just be a picture of one of their favorite uncles in a place they've never been. There will be a familiar avatar in the picture with me - a Flat Stanley.

That's an experience that children all over the world have had. Flat Stanley calls itself the longest-running literacy and community building program on the web. The program encourages participants to carry, mail or otherwise send a cardboard cut-out figure called Flat Stanley to faraway places and interesting circumstances. When the same Flat Stanley that was in a classroom in South Africa shows up in a photo perched on a snow bank in the United States - something magical happens in the minds of the children who sent it across the world. It's as if those faraway places become more real, now the child has a connection with the place and the prospect of making that trip themselves feels more possible. Anything that expands a person's understanding of what's possible is a good thing. Now the Flat Stanley experience is available in a new mobile app, making it easier than ever to use.

AT&T's plans to acquire T-Mobile recieved a setback today when the U.S. Justice Department filed an antitrust complaint requesting that the deal be blocked, Bloomberg reported.

The controversial plan, which was announced in March, would result in AT&T paying $39 billion to acquire T-Mobile from its parent company Deutsche Telekom. AT&T touted the merger as a way to roll out Long Term Evolution (LTE) 4G networks to more customers and foster innovation. Some of its competitors and a few lawmakers have been more skeptical of the deal, while a group of customers have sued AT&T in an attempt to block the merger.

This weekend, many people elected to buy a tablet that runs software whose future is uncertain. Its fire sale price seemed to tip the scales. But we wondered if that was a flash in the pan. Is it something most of you would do, typically, or was this just a reaction to a one-time sale. If some tablet manufacturer tried this as a business model, would people buy their inferior product over the market leader? So, rather than continue to ruminate on this, we asked you, "Would you buy an inferior tablet, over an iPad, if it was priced at less than $200?".

You answered and we culled your responses from Twitter, the original post and Facebook, and used Storify to present it all back to you. If you have additional responses, please leave them in the comments.

The next version of Microsoft's Windows operating system will include an app store and offer a consistent experience across desktops, tablets and smartphones.

Windows 8 is being developed in two flavors: one for desktop computers and one for tablets and phones, with consistencies across both versions. This brings Windows closer to the model that Apple has adopted with its Mac OS X operating system, the desktop version of which has slowly been adopting similarities with the experience iOS offers on iPhone, iPad and iPod Touch. Think Windows 7 meets Windows Phone 7.