From Gamertell's article:
"Those of us with an original DS or DS lite have probably been focusing solely on DS games lately. It's understandable. It seems like there's are at least five new, great games released for the DS each month.
But the GBA slot deserves some appreciation as well. After all, the Game Boy Advance also had a fantastic run with many memorable titles released. It doesn't seem right to leave the slot empty all the time.
So to honor the GBA, and perhaps make the DSi owners a bit envious, Gamertell is looking back at some game series with multiple Game Boy Advance entries that are a perfect fit for on the go play, and maybe even give DS games a run for their money."
Some of the franchises mentioned include Pokemon, Golden Sun, Zelda and Advance Wars.