I applied to the Apple store awhile back, and I gotta say, the atmosphere is pretty cult-like. The employees all seem really nice during that session, but many act very differently when you see them "under fire" in store.
I read somewhere that statistically it's easier to apply to and make it into Harvard than it is to get a job at the Apple store. They really are incredibly selective, and sadly the finalists seem to be picked more for their looks/personality than for actual computer knowledge. If you're young and hip, yet don't know much about Apple or computers, you seem to have a better shot than someone who actually already knows something about the products. Product knowledge will get you the invite, but their process is *EXTREMELY* secretive, and that really bugs me.
I didn't make it to the interview round, but after experiencing everything we went through just for a chance at working in Apple retail, I'm honestly kind of glad I didn't make it. It IS still retail after all (which I'm already part of), and with no commissions and to still be expected to sell add-ons...what was my incentive for selling them again? Just to keep my job? Thanks, but no thanks.
If you know a lot about the products then i would say to get a job at AppleCare. That is where I work and if you know anything about the products then you are golden! Most of us had no clue about anything Apple when we first started there.