I have so many new Web 2.0 tools to add to my NECC '07 presentation, the presentation is now about 2 hours long! I am going to have to replace some of the "oldies" with their newer cousins.
Some I have been playing with this morning.
yourminis: an online aggregrator which is both pretty and functional, with a host of widgets to add to your page, a tabbed interface to add additional pages, and the ability to add your own RSS feeds
bubbl.us: a online brainstorming, basic concept-mapping tool; not collaborative in real time yet, but an easy interface to use with students or at a meeting
peepel: another online application offer, but this one allows you to keep the applications (WP, SS, calculator) all open at the same time in your browser window