WebNotes, which I reviewed earlier, is now officially in public beta. If you didn't catch my earlier review, the basic idea is that you can add a sticky note or highlight any page on the web and then share it with anyone that you'd like. They are going after people that do a lot of research online, and need a way beyond bookmarks to organize all of the sites that they visit. Check out my review for some more information. The small startup company is looking to ramp up usage, so if you want an invite I have about 20 left. Just leave a comment or send me an email if you want one and I'll make sure to send one your way ASAP. 

Best of luck to the WebNotes crew as they expand their service!