Over at Romhacking.Net they have released a load of new translation releases for Sega Consoles:

Syd of Valis (Spanish)(Fully Playable)(GEN)
Mercs (Spanish)(Fully Playable)(GEN)
M.U.S.H.A.: Metallic Uniframe Super Hybrid Armor (Spanish)(Fully Playable)(GEN)
Teenage Mutant Ninja Turtles: Tournament Fighters (Spanish)(Fully Playable)(GEN)
Streets of Rage 2 (Spanish)(Fully Playable)(GEN)
http://www.romhacking.net/?page=news&category=3