Last week, Google launched Google Calendar. I'm all over it dawg!
Google automatically scans your gmail messages and creates hyperlinks when it detects dates you may potentially want to add to your calendar.
You can also add an event to your calendar just by typing a sentence, e.g.
"TeamID dinner tomorrow" or
"Go punch Shaun in the face next thursday"
And the best part: Search!
If you want in, I got 100 gmail invitations. If you don't ... well ... fuck you