My R4 isn't actually here yet but this is what's on my 2gig MicroSD
0005 - WarioWare - Touched! (U)
0028 - Kirby - Canvas Curse (U)
0088 - Advance Wars - Dual Strike (U)
0122 - Trauma Center - Under the Knife (U)
0127 - Phoenix Wright - Ace Attorney (U)
0154 - Nintendogs - Best Friends (U)
0168 - Mario Kart DS (U) (M5)
0177 - Sonic Rush (U) (M6)
0216 - Mario & Luigi - Partners in Time (U)
0223 - Animal Crossing - Wild World (U)
0234 - Bust-A-Move DS (U)
0314 - Resident Evil - Deadly Silence (U)
0324 - Age of Empires - The Age of Kings (U)
0366 - Tetris DS (U)
0367 - Metroid Prime Hunters (U)
0371 - Worms - Open Warfare (U)
0426 - Guilty Gear - Dust Strikers (U)
0434 - New Super Mario Bros. (U)
0559 - Mario Hoops 3 on 3 (U)
0560 - Cooking Mama (U)
0569 - Dragon Quest Heroes - Rocket Slime (U)
0588 - Bubble Bobble Revolution (U)
0614 - Children of Mana (U)
0647 - Need for Speed Carbon - Own the City (U)
0655 - Elite Beat Agents (U)
0661 - Yoshi's Island DS (U)
0689 - Asphalt Urban GT 2 (U)
0732 - Kirby - Squeak Squad (U)
0735 - Castlevania - Portrait of Ruin (U)
0765 - Fullmetal Alchemist - Dual Sympathy (U)
0820 - Phoenix Wright - Ace Attorney - Justice for All (U)
0823 - Hotel Dusk - Room 215 (U)
0847 - Lunar Knights (U) (M2)
0876 - Wario - Master of Disguise (U)
0886 - Rayman - Raving Rabbids (U)
0934 - Custom Robo Arena (U)
0936 - Puzzle Quest - Challenge of the Warlords (U)
0977 - Honeycomb Beat (U)
1015 - Pokemon Diamond (U)
1016 - Pokemon Pearl (U)
1039 - SNK Vs Capcom Card Fighters (U)
41 games with room to spare.