Favorite Song: William has quite a few favorite songs, the most adorable being "If you're happy and you know it" and "Old McDonald" because he has found a way to sing along with them. The most bizarre of his favorite songs is "Rock of Ages" by Deff Leppard. I have no idea why. One weekend it had played on the radio and he pointed at my speakers and said "Button again." I asked him if he wanted the song again and he said "yeah." He will bob his head, move his arms, sing along, and (most adorably) put his hands over his mouth and laugh when the lead singer laughs at the end of the song.
Favorite Show: There are many people who claim a child should not have television until he/she is over two years old. My girlfriend and I have not had the option to remove it, but I've seen enough to know that the television has had an impact on him, and a largely positive one. When he does watch T.V it is almost always "Noggin", and only the shows we have approved of. (I despise Thomas the Train engine.) His favorite show is Caillou, a four year old cartoon child who happens to have about as much hair as fuzzy wuzzy. I don't see the appeal, but it's had a huge impact on him wanting to be a "big boy" and he often mentions "Caillou pee pee" ("Pee pee like Caillou" from what I can translate.) when he goes to use the potty.
Favorite Toy: This is a tough one. William's two favorite toys are cars and balls. Give him any one of these and he will be content for a good amount of time. I would put a great amount of money into a toy that somehow combined the two. A big car with detachable balls for wheels? Would probably lose the wheels within a week. Never mind.
These are all I can think of at the time. He doesn't really have a favorite food, or color, or place to play. I'm sure I'll learn more as he continues to grow.