Books. Particularly The Dresden Files by Jim Butcher and The Hollows by Kim Harrison (the last book is coming put this year ).
Also, Final Fantasy. I own every game (excluding the online games), have a T-shirt, and have gone to three Distant Worlds concerts (plus own the CDs, sing along to the songs with words, and have all of the sheet music for the piano).
I may have been known to geek out over books and movies. Like HP. And Percy Jackson. So on and so forth and what have you.
I may also fangirl every once in a while (like every day I check my FB and see the Supernatural page's pictures... or PJ pictures). Attempts to contain the squees are futile. I've given up at this point.