What you want to be doing is the critical point here. If you're angling for a job with a particular company, find out what technologies they're using that you're interested in, and learn those.

Google's Java, C++, Python; Yahoo!'s C++, PHP, Javascript, Perl, and lots of other stuff; Apple's (obviously) Objective-C. You should be able to get an idea from reading job openings for the companies you're interested in.