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The theory behind it is just that the bigger the size, the bigger the ability to mimic true scanlines' behaviour in a digital environment is. Keep in mind that true scanlines aren't perfectly regular black lines; they vary according to the colors they separate, being even virtually invisible with some colors like red if the screen is not too big:

http://i47.tinypic.com/acto21.jpg

In order to simulate the lines' 'melting', or getting closer to it--since that's still to properly simulate--we need a bigger resolution. Just compare Ronan's samples with any of Postback's screens. Of course, going further, if the size is big enough we could even work in a per-pixel basis for even more accuracy.

You'll soon get used to it. It's easy to understand why the emus' settings aren't 4 : 3 by default -- they're emulators, not simulators. Ideally, we all should be using video hardware capable of the original systems' video modes, so no artifacts of any kind would be needed.

Which "weird results"? "The emulator" removes the borders only if you tell it to do so. With a standard SFC game, you have natively 256 x 224. That's usually doubled for default non-windowed display with SFC emus. Given that 512 x 448 is less than VGA mode res (640 x 480), you get borders. If you want to get true full-screen, you need the emu or the video card to scale it to that res. It's an anisotropic, non integer scaling, so any pre-scaling effect will be affected and indeed the pixels are distorted.

Nope, I meant the game's default fake scanlines. This is material for the second part of my scanlines essay, so without elaborating it too much, many games for the old Japanese computers were designed with fake scanlines in order to prevent the always ugly line-double effect, given that they used graphics designed in low res for RAM and budget limitations.

So when you have something like this:

PC98 TRITORN II

...it's normally because the game was indeed designed so and not an emulation artifact, unlike, say, MAME's.

(And there you have who's the actual inventor of that thing so popular these days as is the fake scanlines. Not many people know that!)

I'd need to know the thumbnails' size in order to answer this, but unfortunately I don't think there'll be a very good way for non-photographs. Best way I can think of is taking the original, non-scaled screen (or just scaled to 4 : 3), adding curvature, blurring it a bit and touching up the colors if needed with IR Fan View.