[atgm]

English and Japanese. I also studied Latin for quite a long time, which means I have a decent stepping stone for all of the Romance languages and can read many of them with a bit of thinking. I've also studied a bit of Mandarin. I also learned American Sign Language for a bit and am learning some Japanese Sign Language now as well.

I'd like to study Arabic and Welsh sometime.

I generally study languages based on how much I'd like to learn that language and how different it is from English. I have a lot of friends that study based on business (Spanish, Portuguese, Mandarin being the big ones), but that doesn't really appeal to me.