It looks like Google Calendar has gone live. I've only played around with it for a few moments, but it really looks great. Lots of customization options, and a clean interface. If you have a GMail account, you can sign up with Google Calendar to try it out (registering with them is merely a matter of specifying what time zone you live in). This new tool should make lots of folks happy, although I personally don't have a use for it. We use the Worst Program Ever Written at work, and outside of work I don't have any need for scheduling events. It should be interesting to see how this ties in to GMail. There is some really interesting potential there. More information on the whole tool can be found over at Matt Cutts' blog (my dad was his graduate school advisor!).