How can I train my cat to do stuff?

Right now I am training him give me paw, and he is doing pretty well. My cat is really nice and laid back, and not to brag, I think he would be a good cat to be on a commercial. He looks like Morris the cat (but cuter still! =) So yeah. What are easy fun tricks and stuff to train him? I think he likes the training because it uses treats. Also, I probably wont carry out with it, I always say stuff like this- but anyway are cat agents exspensive? I couldn't find any on the internet.