The good news is that now that it’s 2008, what was released as beta hopefully should now have some new developments…
Anyway, interesting web app list here, many of them relating to visualization. Of particular note:
– circaVie http://www.circavie.com/
Slick looking visual timeline – lacks a zoom feature so users can’t get a big picture (and loading is buggy sometimes) but interesting features none-the-less, like choosing a timeline object and viewing related documents or even video.
– Sketchcast http://sketchcast.com/
Annotation tool – type, draw, and even record your own voice; exports recording for use on a website.