Would you like to be able to test out various fonts with varying line-heights, weights, styles, etc. side by side? Would you like to test these IN a browser (FF or IE, take your pick)? How about on-the-fly updates and a tool that will give you the css? Well Font Tester is here for you:
http://www.fonttester.com/Works great for applying varying styles to blocks of text. You can test up to 3 different variations.
Enjoy!