Gil's link of the day!
http://www.homestead.com/TemporaryFileStuff9876/TheBest4.html Now you can try and solve a Rubik's cube up to 20x20 in size! Actually, before I moved to YMLP as the host for the link of the day and was sending it by instant message, I had a link which was a guy's recorded progress using a program like this to solve a 20x20 cube. It took him something like 7 hours.