If skrommel's TicTockTitle and jgpaiva's KeyInfo do not play well together, you can use my DClock
with the KeyInfo.
The biggest difference between my DClock and TicTockTitle is that mine is a small stay on top window that you can customize and stick anywhere on your screen. I like to keep it at the top of mine.
You can change the size & colors, and it will give you the date as a tooltip when you hover your mouse over it.
Comes with some other nifty tools you can access from either right clicking the clock itself or the tray icon.
More info about features are on the DClock 2
screenshots of DClock with some of its tools (I need to update these to XP ones):
below are screenshots of Firefox on 9x and opera on XP with my clock at the top