I write mostly H/C - as I mentioned in an earlier post, nearly all my characters wind up broken in some way, whether I intended them to or not - but I've dabbled in crack, humour, angst, flangst, dark!fic, romance, tragedy... I even played with epistolary in my HP_porninthesun fic, and I really liked it!

Although I don't consider content part of the genre, per se, I do write a LOT of BDSM, D/s, slash, threesomes, PTSD, etc.