I just generally watch what I stumble across through friends and other internet related shenanigans.
Now that I think about it, there's only a few animes I've watched that I actually chose to watch by my own decision alone.
Asobi ni Iku yo! - Sorta ecchi. Pretty cool, though.
K-ON! - A bit over-hyped - judging from how much recognition the music has gotten - but nonetheless, I enjoy it.
Lucky Star - The first anime I ever did watch. I just love all of the characters; they're just great. Except Patricia. I hate Patricia. A lot.
Seitokai Yakuindomo - Pretty damn funny, I must say. The humor is rather NSFW, though. (The OP theme is catchy as hell, though. Not that that's a bad thing, the OP theme is good.)
Bleach - It's ok. On episode 35, but I'm too lazy to watch further.
Clannad - ...I hate crying. :l
Azumanga Daioh - ...Ok, so I haven't watched it yet, I'm just too damn lazy to find a torrent.
Kodomo no Jikan - :l ...Don't ask why I watched it, because I have no clue myself. Although, if you disregard the whole provocative loli thing, I thought it was a rather cute anime. Completely NSFW sometimes most of the time.
Pani Poni Dash! - I loved it. The whole anime can be described with "What the hell?".
There are probably others that I forgot, not because I didn't like them, but because I haven't watched them in awhile, or just have lost interest in them for the time being, like One Piece. It got a bit old after the 400th episode for me. Except Death Note. I honestly could never get myself to like it. I dunno why, I just can't seem to like it.