I'm curious as to what you guys play either at the moment, or games you keep going back to.
For me, it's:
PSP:
Phantasy Star Portable 2
Macross Ultimate Frontier
PS3:
Ninja Gaiden Sigma 2
Street Fighter 4
PS2:
Melty Blood Actress Again (yes, weird name)
Nightshade (the sequel to the 2002 Shinobi game)
The games I keep revisiting from time to time (in no particular order) are:
Skies of Arcadia
Valkyria Chronicles
Metal Gear Solid series (any of them)
Phantasy Star Online/Universe
Zone of the Enders (series)
Megaman (series)
Phantasy Star (classic series)
Street Fighter Alpha
King of Fighters (from 96 to 2000 only)