Recently, I've been listening to:
"The Rift Between Decisions" and "True Divine Battle" (from "SaGa 3" DS)
"Burning Blood" and "Save the World" ("SaGa 2" DS)
"Party Battle ~Metheus~", "Tower of the Sun" and "Tower of the Moon" ("Nostalgia" DS)
"Reign of Despair" and "Trouble!" ("Fire Emblem - Shin Monshou no Nazo Hikari to Kage" DS)
Aaaand: "Jungle 2" ("Contra 4" DS).
I love the Sound Test (or whatever) features :p