If you like the use and abuse of language, then here are some fun sites to browse:
Apostrophe Abuse. My favorite of the lot, because, really, what's more annoying than a stray apostrophe?
Literally, A Weblog. This one has made the rounds recently, but it's too good to pass up.
Now here's an odd one: lowercase L. Its author is concerned with inappropriate usages of lowercase l.
A new, yet utterly compelling, language blog: passive-aggressive notes from roommates, neighbors, coworkers and strangers. Really, can it get any better?