I really don't understand why there aren't any cam-recording thingies given as a feature. Space isn't that much of an issue ... MemoryStick is a lot more expensive than SD and the PSP can record and edit with it.
Since Skype can be used on psp2000+ it would really have been nice to have something like that on the DSi too, but ones again .. most likely the homebrew peeps will have to make (something like) it.
0.3MP really doesn't matter that much in whole ... I've seen 5MP camera's taking photo's so bad it looked like a childs toy. My 2MP camera still beats almost every camera out today imo ... although it needs a steady hand and good lighting. Then again, although picture seems fine, it isn't really that fast (prob due to the few pixel/no alternating them).
I think the biggest plus of the increases screen size is better pixel/stylus control ... but I also do think the image quality will go down a lot. (Try a GBA game on a GB(A)-Micro, you'll see a LOT of difference ... which isn't actually there).
My biggest "feel-warm" is about the CPU being twice as fast and the 4 times the memory, although there aren't any games that use it yet, homebrew would be so much better. Quake 2 might be able to run ... and if it could, it should be faster (I doubt SLOT2 access can even BE faster then the internal memory of the DSi) and a lot of stuff should be able to be done since in relative form a LOT less memory is used (eg: a homebrew which uses 2 MB ... only has 2MB free, in DSi it should have 14MB free ... 7x more).
I'm really anxious to get one (imported both my GBA and DS) ... but I only see a real plus when homebrew can be run on it. Untill I see a real must-buy, I won't buy a DSi untill it has homebrew capability.
/me still being puzzled why companies being so awkwards toward homebrews.*