Do you mean fun to get into as in making the software or just playing as an end user? I know the NES/SNES/GENESIS scene is thriving, an unexpected popular outlet is Game Boy titles as well. There was a game development comp about 6 months ago held to make N64 games. I think the next few years for homebrew will be really exciting. If you have other questions about gaming stuff I usually delve into all imported games and hardware. There is tons of schlock released (especially for licensed tv/films) but always lots of decent stuff.