"This tool is for trying out Google web fonts on your layout in real-time! Start by inserting your address and hit "OK". After that simply click on any inline-element."
Something which I developed for my own use and then decided to publish it. Did some tests this morning and decided to remove "padding" slider, and replace it later with "padding-left/right/top/bottom".
http://www.webgen.fi/font-preview/
Any feedback is welcome!