This is probably old hat for type nerds, but this chart clearly lays out some of the crucial distinctions between Arial and Helvetica. The Q distinctions are especially critical!
http://cheeseorfont.mogrify.org/play
The ultimate test of sophistication and skill for the cheese/font enthusiast.
Tech Buzz Helvetica or Comic Sans? Your font type can be very revealing — take this simple quiz to find out which font you are.
A designer's dream college-room-poster! This is not just pretty to look at but also grouped by families and classes of typefaces: san-serif, serif, script, blackletter, glyphic, display, grotesque, realist, didone, garalde, geometric, humanist, slab-serif and mixed.
Tech Buzz This one goes out to those who live in the overlap of Venn diagrams labeled “good oral hygiene” and “typography lovers.” Keeps your teeth clean and your message clear.
http://new.myfonts.com/WhatTheFont/iPhone/
The popular application that can identify fonts is now for the iPhone — now with just the snap of a camera, you can find out the fonts behind your favorite streetside typography.
Culture Buzz A tumblr devoted to documenting the strange, beautiful world of urban signage. Nice browsing for those with a taste for the semi-industrial informality of city typography, or just a love of ad-hoc signs.
http://fontstruct.fontshop.com/
A site to easily make your own fonts. It's got a kinda limited pallet, but it's free. No complaints here.
Tech Buzz A nifty little web application that generates a word cloud from any text document. If you are a tag nerd, enjoy fonts and folksonomy, you probably don’t have a girlfriend, and will have plenty of time to play around with this.
Style Buzz Create your own font. In seven (fairly) easy steps you can transform your handwriting into your own font for use on your computer’s word processor. While the service is distinguishing and original, I would certainly fear for whomever is on the opposite end of a printed document written in my “font.”
Politics Buzz Who would you vote for, if you only had fonts to go on? Looking closely at the official campaign fonts of the three remaining candidates reveals a lot about their message (and it’s of interest to more than just design geeks, I swear).
Culture Buzz A group of 26 bearded men are suddenly everyone’s favorite font. Finally a font that reflects the needs and desires of bearded men.