[[[[Spotlight says...my Music Folder 🙂 So, the same place the rest of your iTunes files go. I've changed the default, but if you haven't, your iTunes music folder is nested neatly (and unecessarily) inside your Home directory's Music folder.]]]] <-load of crap
Edit...Whoa! I wasn't paying attention. I somehow switched "iTunes" with "iPhoto"...don't ever read my replies again. Instead, read what gekko wrote (et al). I was thinking imported videos from iTunes...ugh I can't multitask near as well as I used to....😱
The only thing useful that I mentioned was going to a default folder, and if you have OSX 10.4+, use Spotlight to track down filenames. Sorry for the confusion...that I introduced.