I LOVE Panel de Pon, like the music and characters and everything.
On emulation, I think at this point SNES and GBA (and older stuff) are okay. I've never tried any other than those two though. It could be borderline cheating if you really abuse the fact that you can save your game anywhere, but it's not like you'd be tempted to do so to the point you're ruining the games.
Random, but I really love Märchen Adventure Cotton 100% (SNES). I usually don't like shooting games at all, but I've played this one so many times. Ugh, this video makes me nervous because the person would stop shooting at times while moving around when you could just keep holding the shoot button and never have the monsters get too close to you.
The music is amazing too.

[youtube]OheFjpPj4sM[/youtube]
Oh, I got my 3DS and Animal Crossing, so just let me get used to it and all.
