Programming challenges

[Clam]

I don't believe I've told anyone this yet, but I'm learning to program in Java through a university course. Now, since the course is nearing its conclusion (in fact the last lecture was today), and we've really only covered the essential stuff, I'm looking for something to help me stay sharp and improve my skills. So, for the past couple of days, I've been looking for some "challenges" that are suited to a beginner-level programmer.

I found this site called http://projecteuler.net/" class="bbc_link" target="_blank">Project Euler, which has heaps of really good puzzles that you have to write a program to solve. The trouble is, it's nothing but maths problems. Which is great (in fact it's fantastic, and I plan to continue with it), but I'm looking for something different. Something that's not just about numbers, and preferably something with an OO flavour (since that's what Java does).

Is anyone else interested in these? Does anyone know of a good challenge for someone at my level, or a place where I can find some?