Tomorrow: Izuna: Legend of the Unemployed Ninja & Trioncube (heard good things about those)
5th March: Wario Master of Disguise
6th March: Rayman Raving Rabbids
13th March: Spectrobes
19th March: Custom Robo Arena
20th March: Theme Park DS
23rd March: Flipper Critters, Bubble Bobble Double Shot
27th March: Konami Classics Series: Arcade, Lost in Blue 2
30th March: Chronos Twin, Impossible Mission, Settlers DS
4th April: Death, Jr. and the Science Fair of Doom, SNK vs. Capcom Card Fighters, Final Fantasy Fables: Chocobo
22nd April: Pokemon Diamond & Pearl
Dates are mixed between US & UK and will probably change, this isnt a complete release list just the games I've got my eye on. After April, well thats a long way off in gaming as most of those release dates are a bit iffy but you could always, you know GOOGLE! Or try
http://www.gamefaqs.com/portable/ds/ they're pretty reliable.