In my spare time, I cook a lot, play music (harp, saxophone, piano, and maybe now qanun), enjoy French (reading novels, watching films, etc.), and hang out with other grad students playing board games, ultimate frisbee, and doing other assorted things.
A couple mathy blogs I follow to some degree:
Secret Blogging Seminar
AMS Graduate Student Blog
Math Goes Pop!
Webcomics:
xkcd
8-bit Theatre.
(This one has ended. So sad.)
Ubersoft Help Desk
Sluggy Freelance. Probably my favourite, but pretty epic. I haven't actually read it in a couple of years, because I like reading it in
large chunks. (You get used to reading the archive...)