When the DS Lite came out (on my birthday, no less!) I immiediatly made an upgrade (despite just getting my DS back in December) and I tell ya it's a world of difference in picture quality w/ that brighter light. Even a co-worker of mine who desn't even play video games kept commenting on how much better it looked.
Colors are more vibrant, you can actually see things you couldn't see before. it's just marvelous.
Also: concerning DS vs. PSP I was really on the fence on whether I'd actually get a PSP or not (I knew the DS was a lock for me. Just needed a game to come out that I really wanted to justify buying it. That and a price drop.). I personally thought the disc format (and a propitary format at that) for a portable was a risk and the price was too rich for my blood. But it jus looked so sleek and cool and could have some potential... eventually.

But I was at a point where if a game that I really liked would have made me get it.
But then it was released....
And some people were complaining about how the right d-pad and square buttons could get stuck...
and someone opened one up and saw groves cut into the lcd screen edge to accomadate said right d-pad and square buttons, which, if they move too far over, could cause them to get stuck...
At first I thought. "ah. that's all right. something they could fix later. after all it was just launched. surely there were some flaws they failed to see and will rectify later."
Then Ken Katuragi opened his big mouth and stated: (may not be exact quote, but pretty close to it) "It was done that way on purpose. We didn't want to make the system any bigger or the screen any smaller. So get used to it."
When I read that I thought "What a moron." and felt quite insulted. From that point on I thought "'Get used to it?' All right. I'll 'get used to it'. And I'll tell you how I'll 'get used to it': I won't buy the thing. Ever. No matter what game comes out for it. THAT is how I'll 'get used to it'."
And to this day (and more than likely the foreseeable future) I've lived up to that promise. Course the system's line up of games helped in that aspect.

The most that a game got to me (cept loco roco) was a mild intrigue. And whenever I even feel a slight intrest in a PSP game that quote comes to mind and dashes the thought away.
despite that tho I still support the PS2 and am considering a ps3 (mostly for games like MGS4 and FFXIII) but PS3 hasn't been bought yet because of the absurd price. And to a lesser extent some of sony's chatter about PS3. Tho I'm willing to chalk those to rambling of people who have lost contact with what the gamer's want while saying they still know what the gamer's want.