ReadWriteWeb

BlockChalk is an anonymous message board for your neighborhood. The company's founders want to enable neighbors to interact with each other while protecting everybody's privacy. At it's core, BlockChalk feels a bit like an anonymous, location-based Twitter clone.

BlockChalk just released its native iPhone app (iTunes link) today and also offers an app for the Palm Pre and Pixi. Android users can access the service through a mobile website.

Seesmic just announced the launch of Twitter lists in its browser-based Seesmic Web Twitter client. Earlier this week, Seesmic released the first desktop Twitter client with support for lists. Despite Seesmic's best efforts, Brizzly managed to become the first company to release a web client with support for lists earlier today. Seesmic Web offers another first for web-based Twitter clients, however: support for Twitter's geolocation API.

Trapster is a new mobile application that lets you see and share the location of speed traps right on your mobile phone or GPS device. Once installed, the app uses a combination of your device's internal GPS capabilities, geocoding techniques, and voice transcription to alert you in real-time to any reported speed traps in your area.

Of course we know we're not supposed to be speeding in the first place, but a little heads up never hurt anyone. Besides, who can afford a ticket these days?

Today, the old real estate adage 'location, location, location' could just as easily be applied to the Web, where it seems that "where you are" is becoming as important as the information you're seeking.

Nowhere is that more apparent than with GPS-enabled mobile platforms that use location-specific information to simplify the way people access and share content on a daily basis. Later today Mozilla will release Geode, a Firefox geolocation add-on which will enable localized content.

URL shorteners like TinyURL are a wildly popular way to share long links over email, IM, microblogging and other contexts. The millions of shortcuts that have been created through such services represent a huge opportunity to capture interesting data - but to date those opportunities have all just gone down the drain.

Bit.ly, a new URL shortening service from the innovation network Betaworks, is launching today with a staggering feature set for both end users and forward-looking developers.