Word hawk

When I was looking up the word faux hawk, I came across Word Spy, a site that's "devoted to lexpionage, the sleuthing of new words and phrases. These aren't 'stunt words' or 'sniglets,' but new terms that have appeared multiple times in newspapers, magazines, books, Web sites, and other recorded sources."

If you're into the provenance of words, it's a good site that's easy to read and understand (ie, not full of linguistic-speak packaged in a complex writing style).