Picked up the original Super Smash Bros on the Wii VC two days ago (mainly because its was a CLub Nintendo reward and it was the only Smash game I didn't own yet until the new one is released) and I've already unlocked the 4 extra characters, the 1 extra stage, the Sound Menu, and the Item Menu (or whatever the menu that manipulates the items that drop in a match is called). I can't remember if there's anything else though..... Otherwise I'll probably play it for a few mroe days before going back to one of my other unfinished games.