Google Web Fonts
Google Web Fonts is an amazing resource I stumbled onto recently. It is a free collection of Web Fonts. No more being stuck to the same old Arial, Georgia, Verdana, Times New Roman, and the ever famous "Trebuchet MS".
These are web fonts that are supported in pretty much all browsers (including IE 7 and up).
Take a look at the gallery, I know I'll be switching quite a few fonts on my site soon.