Can this run Android?
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Android can run on the iPhone 3G and a few other devices, and they have pretty good processors in comparison to the DS. Android runs terribly on these devices, and they have pretty decent development too. So as far as the DS being able to practically run Android, I would have to say no. Also, even if Android was working on the DS, it would be far away from being able to play apps/games. Just because you can emulate/run a OS on a console doesn't mean you have all the goodies that come with it.
Say one day we can run android on the nintendo ds. Well if/when that happens WiFi most likely won't work. Graphics-Acceleration won't work. And many other things. So games/browsing won't even be possible. These things take time to develop, and they don't have enough of a demand to happen. It is more practical to find Android released on Tablets/Smartphones that weren't expected to run android.
If the 3DS had android, then it is possible because the processor is much faster than the original DS. However, the 3DS can't even run homebrew yet, and 1:1 game playback isn't even finished by crown3ds (which might not even be real). If in fact we do one day hack the 3DS to the scenes desires, then hope to see android on it.
Final Note: You won't be seeing android on a DS, and if you ever do, it won't run well. Period. Look towards other devices for this functionality.