Ooh! great suggestion, i can't tell you how many times i have wanted to play a game in my favorite, but when i went to my page i didn't see it on the page, so i had to search through all my favorites
I love the idea, but I don't think it will be noticed for now.
I think 10 favorites is good because that is all that can fit on the page. @mrtim, like DragonMistress said, the friend fav would be like MySpace. This site should be as original as possible. I still love the idea though! ~