All writing and no play makes us...crazy. AND boring. So avoid that by spending some time goofing off on these fun (and yet somehow writing-related) sites! I'll start it off.
The Seventh Sanctum: This is a site with a bunch of random generators. More for fun than anything.
Inkygirl.com: The name says it all: "Daily Diversions for Writers." Run by Debbie Ridpath Ohi, this site has gifts for writers, comics, and random writing articles.
How Many of Me?: Plug in your name and the site tells you how many people in the USA have your name! I use it for character names and any pseudonyms I want to try out.
Shakespeare's Den: This one is a shop. But I love goofing off on this site, because they have the absolute coolest things. And a lot of them are writing and book themed.
That's all I've got for now. Post more as you find 'em.