Want to try out Xobni, which I reviewed live from the TechCrunch 40 conference? The company has opened up 25 invitation slots for Webware readers. Go to the beta sign-up page and enter the invitation code, "Webware." Act fast if you want the bits.
Fair warning, though: I have uninstalled the Xobni add-on from my system. I found that it slowed down my Outlook performance so much that it became unusable. The company knows that the current beta code has performance issues for people with big e-mail stores (mine is about 7GB, which is probably not uncommon). I will revisit the product when the team says it's fixed the issues.
In the meantime, I may try Clear Context, which a few readers recommended to me (on top of the comment from the company itself in my Xobni review).