What Web apps increase your productivity?
GavinB: Dropbox.  I don't have to worry about backing up files, and I know if I screw things up I can revert to old versions. Not to mention, sharing files is as easy as dropping them into a folder.I've been using BackPack for to-do lists, but it doesn't have the depth of features I need.  Can anyone recommend a to-do list app with good nesting functionality?