I love me some beat-em-ups =)
Final Fight (arcade or Sega CD), Golden Axe series, Streets of Rage series, those two D&D arcade games, Advance Guardian Heroes, Kunio-Kun series, The Punisher (arc), Combatribes (arc/SNES), TMNT series, etc...
Probably a bunch I'm missing...I think Capcom made 75% of all of the beat-em-ups themselves @_@
Oh yeah, and there was this game for PC called Ragnarok Battle Offline that my friends and I were playing for a while, it was pretty cool.
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I'll brave the storm to come, for it surely looks like rain...