Honestly, I don't see the DSi as something much better than the DSL. It may be SLIGHTLY slimmer and have a slightly bigger screen, and a crappy camera, but thats it. That alone, is not worth the upgrade to me.And if you read the link I posted earlier, reviews say that the DSi has a MUCH shorter battery life than the DSL. Probably because it has a bigger screen and a slimmer design and more random crap to add to it.
I remember a while ago, I made a post on WiiChat.com about why the Wii doesn't have DVD feature. People got very angry at me, saying people preferred having "gaming consoles" ONLY for gaming. Meaning, it's not a big deal. While the minority felt like if Wii supported "channels" and "remotes" and even internet browsing, DVD compatability seemed like it would be a standard feature. We all know Wii has the hardware capable of playing DVDs but does not have the software (unless you have it modded).
Anyways, in the same light, I find it even more absurd to add a camera to the DSi. I'm not gonna be playing a game, and suddenly go "Oh crap i need to take a pic of this". I just think its extra fancy shmancy stuff just to get people who already own a DSL to buy ANOTHER DS, or for people who don't have one yet to feel like it's finally worthwhile to buy one since it's a camera AND a mp3 player as well.
Same thing with iPod making the iTouch almost like an iPhone.