From a technical perspective, 480p is essentially higher resolution. 480i traces every other line when you view it, giving more or less an effective resolution of 240 lines. Or thereabouts. While it's true that the lines may be different on alternate scans, you still are only getting 240 lines drawn with each refresh of the screen.Originally Posted by BrandonMcAuslan
The big bonus with component is that you're separating the different video channels that come over the line. With the standard component, they're all on the same line, thus you get some blending, this is not the case with component -- each of the components (Luminance, Red minus Luminance, Blue minus luminance) is on it's own wire, with it's own ground.
Believe it or not, the jaggies are actually there in the composite, but it's just that the interference from using a single wire "hides" them. That's why you see the jaggies in 480p, because they're not hidden. The solution, move back a little from the TV.
In reality, 480p won't increase the signal quality a ton, but it will make fine details a bit more differentiable. So while it won't have much more resolution, you'll be able to see the textures and details better.
With regards to Zelda: Twilight Princess not being designed for 480p resolution, please check your facts before posting that. The fact of the matter is that the Gamecube supported progressive scan games, and progressive scan Gamecube games will be progressive scan on the Wii. There have been progressive scan Gamecube games for years (most new ones are progressive scan, certainly many of mine are -- windwalker, nfs: underground, metroid prime). I'm sure that the game was designed with 480p in mind.
Although it is a little disconcerting seeing the jaggies, like I said, back off a bit from the TV and you don't notice them. There isn't much space on a 640x480 display to antialias the jaggies away. Anti-aliasing at low resolutions just leads to the blurries and the fuzzies, which are even more despised.