Hi. I just finished the Head First Book and I am about to start on the 1.5 certification book. In the mean time, I was wondering what open source projects might be good for me to download and start reading the code for? I thought it might be a good idea to download one and go through the code, marking it up with what I think it is doing and looking up things I don't understand. Any pointers to good software to do that on, would be great!