ReadWriteWeb

This could be your next social productivity platform. It's free, it's cloud-based, it's synchronized, and it can integrate with your Gmail. And even if you've never heard of Salesforce.com, you'll know it now. Do.com is for real.

ReadWriteWeb has been authorized by Salesforce to grant 200 invites exclusively to the first of our readers who sign up.

Spotify has finally arrived in the U.S., the company announced this morning. But the full rollout is still underway. Interested customers are being asked to sign up for an invite on the company's homepage, if they haven't already done so.

But regular (and fast!) ReadWriteWeb readers wanting to cut in line can get their invite now, no waiting.

Quora, the super stealthy startup that was started by Facebook's first CTO Adam D'Angelo and that is now in private beta, is beginning to crack its doors open for press, and the ReadWriteWeb crew is impressed and already mildly addicted.

It's a user-generated Q&A with real-time elements. It's useful and fascinating, with similarities to apps such as Google Wave, Aardvark, FormSpring.me - but it's beautifully built and easy to use off the bat. Read on for details on how to get your invitation for this still-private site.

Google just officially announced that it will send out 100,000 invitations to preview Google Wave tomorrow. These accounts will go to developers who are already in the developers preview and users who signed up for accounts at wave.google.com on a first-come, first-served basis. A select number of Google Apps users will also get access to Wave. Google first unveiled Wave in May and since then the team has focused almost exclusively on making the system more stable and scalable.

Here's a survey question for you: Do we really need another Web-based survey tool? There are any number of respectable and useful survey products out there today, all of which do a fine job of soliciting responses from a constituency. So when we started to review Survs, the latest entrant to dip a toe into the online survey pool, we were cynical, to say the least. But as we dug into Survs, we found some thoughtful features that had us revising our answers, changing the radio button from "No" to "Maybe."