Upload & Sell: Off
This is semi on topic. I get lots of people asking me the "what lens should I buy" question. Of course they don't want to spend much money and the thought of something that is $1000 that has a very specific purpose is out of the question. I recommend the 50mm f/1.8 more than anything. It's only short coming is it's 5 blade aperture, at least in terms of IQ. Anyway, at $99 it gives people a taste of that bokeh that so mysteriously sets apart the "pro" photos they are used to. It actually allows them to shoot with out camera shake indoors and it's a nice medium focal length. It's gotta be the best lens per dollar you can buy. Sure, there are plenty of lenses that are better, but almost none that are this good and this cheap. I wish THIS was the consumer DSLR kit lens. but I know, that is silly.
Of course on a cropped body the argument for the 28 f/1.8 or 35mm f/2 could be made too, but they are still not $99 so they are a tougher sell.
That new 35mm F/2 IS could be the perfect "only prime" too. F/2 with 4-stop IS makes it almost invincible in low light. I don't own one of those though so I'll stick to what I know.