Just this week I played through the original SMB, using no warps. It's amazing how much of the game you miss when you warp through -- 75%!
In the past few months on VC I've beaten Actraiser, DKC, SM64, Kid Icarus, and SF2 Turbo (on 4 stars, cause I suck).
Not exactly "old-school," but I did play through Metroid Prime again recently, and completed it on Hard difficulty with 100% scans to unlock the rest of the art galleries. This game is too fantastic for words... still amazes me after 5 years. I played the Ridley and Prime battles, over an hour, literally on the edge of my seat on the couch. My girlfriend had to give me a back massage as I watched the credits, because my hands were shaking when I put down the controller.







