Ever wanted to do things like: 
$ google picasa create --title "My album" ~/Photos/vacation/*.jpg 
$ google blogger post --blog "My blog" --tags "python, googlecl, development" my_post.html 
$ google calendar add "Lunch with Jason tomorrow at noon"
$ google docs edit --title "Shopping list" --editor vim
at the comfort of your command line?
This is now possible thanks to GoogleCL, a command-line utility that provides access to various Google services.
Get it: http://google-opensource.blogspot.com/2010/06/introducing-google-command-line-tool.html
It would be incredibly simple for someone to create this as well, given that they have APIs for virtually every service available.