I did this a long time ago. I can't remember exactly everything I got, but I know I have the list of stuff posted somewhere, probably the old SDA thread. I remember you could get crazy stuff like 16 hearts I think, all dungeon items, 4 bottles (rba 3rd), zora tunic (rba'd), suns song, and lots of other shit. Its been a really long time since I did this so it might be possible to get more now.
Well, we want to do all the stuff we can do without RBA we think, so if you can find the list, that would be cool to compare stuff. Still getting used to hovering with the slingshot method, seems to work only half the time, but once we get a rhythm down then we're fine. My favorite move has to be that megaflip thing though.
EDIT: We were actually able to megaflip into the great fairy cave from above in Death Mountain where you get the double magic bar. Was rather awesome. Not sure if that's the most efficient way to do it, but it worked.