For OS X: This will allow you to add events by typing a few words and hitting enter. Then you get to watch as the new event(s) are magically synced to iCal.
What you need:

gcalcli (and prereqs) -  http://code.google.com/p/gcalcli/ (don’t worry. installing these aren’t as difficult as it seems)
gmail/gcal account
ical
Script Editor (comes with your Mac)
Calaboration – http://code.google.com/p/calaboration/

Install [...]