If you love music but sometimes draw a blank when you sit down to the iTunes Store, try making a cheatsheet to help you remember all those songs you want to download (I keep a small notebook with me and write down song names as they come to me).
If you need more inspiration, have a look at Fiql.com. It's a social playlisting site where people upload their playlists and share them with others. I've found songs I'd totally forgotten about by typing in keywords like "80s" and "hair band" and even "purple songs"! It's on my daily go-to list now.