Too bad I'm going to run out of good DS games to buy pretty soon (not that I'm actually going to buy one a day, this is just a linker comment.)
But yeah, set up a nice GBA environment in VS2005. Its got all the kewl stuff. Like the buttons work (pressing build actually builds the *.gba file! And pressing debug opens Visual Boy Advance with the output file!!). Nifty. Been banging my head for days tying to get the damned makefiles to work, finally managed to do it. Now I just have to figure out how to get Visual Boy Advance to debug...
(oh, and if anyone is interested in a detailed description of how exactly I did this, just post a comment and I'll write the sucker up. Needless to say, its actually really easy to do. There's just craptons of places that you can screw up on...)
Still looking for DS title recommendations. I was browsing through the complete list of published titles over at NintendoDS and saw about 3 more I wanted to get, in addition to like 4-5 that come out this fall.