I just played a bit with Ripplerap, a tool to take and share notes during conferences. Brilliant. If downloading and unziping is too much for you to get an impression, take a look at Phil Whitehouse's ripplerap-is-about-to-be-born post.
It is in its infancy, and there are several things that need some ironing, but I believe that its simplicity gives it a huge potential. Good news for us compulsive note takers and/or conference-life-blogging addicts.
And I must confess that I did not see much of a point in one of Ripplerap bulding blocks, TiddlyChatter...
Update: It is a funny coincidence that the very same day that I played with Ripplerap for the first time, fellow IBMer Sacha Chua - tech evangelist, storyteller, geek - made me aware of this collecton of tips for conference bloggers.