While there are lots of neat applications for the new Google Command Line tool, this one is my current favorite.
As seen on Lifehacker, using Vim with Google Docs:
google docs edit --title "To-Do List" --editor vim
A close second (from Google’s Examples):
google contacts list name,email > contacts.csv
I hope to soon see something like:
cat ~/message.txt | google mail --to "email@example.com" --subject "Awesome!"
google voice call 555-5555 --phone "work"