See a font you want but don't know its name?

So, as most of you know I just recently got an iPhone.  So far I love it.  It's also definately going to come in handy when I do get a job and when I go back to school.  I can check my email, facebook, etc. straight from my phone.  There are like millions of applications you can download for your phone.  I haven't purchased any yet but I have downloaded some free ones.  One that I think is SO COOL that someone came up with is called WhatTheFont!
Have you ever seen a font on someones blog or wherever and really like it and wanted to know what is was called...but had no way of finding out??  Well, all you do with this puppy is take a picture of the font and it tells you what its called.  I haven't used it yet, but I can't wait until I do.
Katie, I know you are reading this and this is making you want the iPhone even more. hehe
Oh, and if your not an iPhone user, you can visit this site and it does the same thing as the iPhone application.  Enjoy!