I've got a fun fact for you all.
The DSi is not the DS.
Nope, its a completely new console.
I suppose its the same kind of thing as the Gameboy Color was for the original Gameboy.
Funny thing is: since all they added was that 'i' to the end of the original name it creates quite a bit of confusion.
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Specs for the DS and DS Lite:
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CPUs: 1x67 MHz & 1x33 MHz
RAM: 4 MB
STORAGE: 256 kB
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...
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Specs for the DSi
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CPU: 1x133 MHz (x2 the fastest processor of DS)
RAM: 16 MB (x4 that of the original DS)
STORAGE: 256 MB + SD card (potentially 2GB or more with SD card alone)
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So I guess it makes sense that it will have exclusives that you can't play on your DS and DS lite. 
Disclaimer: I appologize for anyone who already knew this. I only came to this realization after I read about it on Wikipedia...
I was just so excited I just had to blog about it.