This depends a lot on the person and what type of work you like to do. Perhaps take a dive into iPhone (Obj-C) or Android development (Java)? You could also c

This depends a lot on the person and what type of work you like to do. Perhaps take a dive into iPhone (Obj-C) or Android development (Java)? You could also consider going for something totally different -- most of my experience lies in C based languages and I've noticed that picking up another one of those languages is usually not that hard and thus less interesting than trying out for instance Haskell, Erlang or Ruby.