I missed this when it was posted, but Solution Watch has an excellent and very useful note taking resource. The post covers applications for public and collaborative note taking, private note taking, online document creation, voice recording and even online databases.
For what it’s worth here’s what I use in each of their categories:
Quick Public Pages: Backpack
Online Documents: None (I just access my documents via FolderShare)
Voice Recording: Odeo
Online Database: None (thank goodness)