Picasa (photos)
Docs
YouTube
Blogger
Calendar
Contacts
But they are wanting it to be able to do more as Python libs develop, or as they write their own libs to make up for the lack of support in their API. Some examples as to what you can do with it:
$ google blogger post --tags "GoogleCL, awesome" --title "Test Post" "I'm posting from the command line"
$ google calendar add "Dinner party with George today at 6pm"
$ google contacts list name,email --title "J. Random Hacker"
$ google docs edit --title "Shopping list" --editor vim
(Yea that just happened!)
$ google picasa post --title "Vermont Test" ~/old_photos/*.jpg
$ google youtube list
To read more about it, to get it, report bugs/wishlists, or to contribute to it please see their project page at Google Code
Tip: if on a Mac it can be easily installed with Macports by running this command
$ sudo port install googlecl
