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There seem to be a lot of confusion about the NES resolution and displaying.
So, I put together this little illustrated page to try and clear things up.

The basic problem goes like this:

This is the way the Kirby's Adventure startup screen looks on a TV
Nice, round and plump isn't he?
This is the way the NES is intended to be displayed.


Now consider this picture, this is how it looks in a "raw" shot from a PC emulator
Kirby looks a bit thin and stretched out doesn't he?
This is because it is not displayed as intended, on a TV.


Now take a look at this third picture which shows the same screen displayed on the GBA through PocketNES.
Sure, Kirby looks a bit wide, but not really more distorted than in the raw PC emulator output.
(The color differences appear because PocketNES is adapted for the GBA display)
 

Now compare this with the display options available on PocketNES

How it would look on a TV	PocketNES scaled	PocketNES unscaled

You clearly see that the scaled option doesn't actually distort the proportions much compared to the way it is intended to look on a TV. In fact the unscaled raw option almost distort the proportions just as much, only in a different direction.
Also notice that the TV actually cuts a bit of the full NES resolution off. So only a small part of the display is cut off with PocketNES in scaled mode when you compare it with TV output.

The FAQ has more info on how exactly PocketNES scales the NES screen down, which lines are cut, etc.

The Screenshots page has more examples of scaled and unscaled PocketNES screens.

Quite a few people has suggested that the NES output should be "proportionally" scaled down to fit into the GBA screen, but as you can see above, the raw emulator output isn't even proportional to begin with.
But just as an example I scaled down one raw emulator shot. Note the black bars on the side to fill out the GBA wide-screen display. Also note the tiny distored graphics, and barely legible text.
The superimposed ban-sign is just there to point out that this mode is not available and probably never will be. If you're still not convinced, check out these lovely examples.