Google just released the Google Command Line Tool, which provides access to Blogger, Calendar, Contacts, Docs, Picasa, and YouTube from a command line. I know I'll probably be using this... well, all the time. So much faster to add YouTube videos or calendar entries like that.
Granted, most users of these services won't care, since they're generally not Linux users and would hate to try and use a terminal... but hey, for those of us comfortable with it... perfect!
http://google-opensource.blogspot.com/2010/06/introducing-google-command-line-tool.html
http://code.google.com/p/googlecl/
