Google calendar ought to be easy..

Its got a great easy to use UI...and you can see other people's stuff.
Fab!
Then what? It lets you down!
XML & ical interfaces, but you try getting it working seamlessly with M$ Outlook (including recurring appts...eh? Eh?)
And what about with Google grps where u really want to integrate? Insert the code, previews nicely, then...doh!

Make it work! Please!