Check out Yahoo! Widgets - you might find something suitable. Don't worry about the Yahoo! bit - this a really nice widget engine.
If you can't find anything, you could always run Google Calendar or some such in a separate window.
'There are moments, Jeeves, when one asks oneself, "Do trousers matter?"'
‘The mood will pass, sir.’
P.G Wodehouse -- The Code of the Woosters
It Ought to be Easy | Greasemonkey scripts