interesting subjects in math(s)?

looking for notable things to read about, graduate levelish, pure math preferred.

that bookchan looks sexy.

thanks for all helps herein, and in case anyone has further suggestions/comments, i'm in my third year at uni, got real/complex analysis, number theory, linear and abstract algebra covered, as well as some graph theory, topology, probability.

i recently got http://www.demonoid.com/files/details/477956/4633242/
these, but haven't really looked through any yet.

physics is also rather interesting, but i like to listen to nice people talk about relativity and quantum theory much more than actually do anything.