I have been playing the Simpsons demo since last Thursday on the PS3. Its friggin AWESOME. The amount of hilarious dialogue recorded for this one is amazing. Kent Brockman is always commenting on what is going on as you try to stop the Lard Lad from destroying Springfield and creating evil little Krusty dolls that will attack you and say funny things. Homer can inflate himself with a helium tank and he talks in a very funny high-pitched voice afterward. All very very funny. It looks better than most games too--like you are really playing the cartoon!! Still don't know if it is worth $60 right off the bat, but it is loads of fun.
I hope the Conan demo is good too. Again, I can't imagine paying $60 for what is essentially a hack-and-slash that doesn't frankly look all that epic, but it should still be a good one to pick up after a couple of price drops.