Yes the DS Lite is kicking A$$ and even I, a hardcore PSP user plan on purchasing one soon.
However, with the recent brilliant work of Exophase and his stated continuation in developing gpSP, GBA can now be played on the PSP which now makes it far better than the Nintendo DS.
In terms of commercial game quality, its going to be a no-holds-barred shootout for the next 3 months with TONS of great games coming out for both the PSP & Nintendo DS. Even the GBA will see Final Fantasy V & VI released soon. And if they are playable on the PSP, I'd rather play them on the PSP hardware rather than the DS or GBA hardware.
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