Do you struggle to remember what fonts look like? Would you like to compare fonts against each other without manually formatting individually? Well then give TypeTester a try. TypeTester allows you to compare a number of fonts on the fly, and best of all online.

You can also compare colors and sizes. Thanks to LifeHacker for the link.

I’ve had that service bookmarked for what seems like an age (that and several others,) all of which I keep forgetting to use!
Thanks for the reminder…
yeah, i heard that it is actually an old service in a new outfit, nevertheless new to me :) a useful typographical resource
If web typography is your thing, you might want to Google up sIFR and have a play around with that…