This is why people get excited about iPhone apps. With Box Office, if you want to see a movie and don't know what's playing, you just open it up. It'll detect where you are, find theatres around you, and list movies playing by their RottenTomatoes score. Want to get tickets? Click on the time you want and it'll toss you to Fandango to buy them. You'll get the whole process done in no time. If they added streaming trailers in to this app somehow, it'd really be taken to the next level, but even as is it's one of our favorite apps so far that we'll definitely be using all the time.
It doesn't matter who wrote it or who they work for- what matters is that because of the way Apple has decided to distribute their apps, developers are guaranteed maximum exposure for their efforts.
It may well be that there are thousands of apps available for Window's powered smart phones but for the average Joe what does that matter if he can't find and download them easily. I can only see the App store becoming more important as time goes on.
Any developer that's on the fence because of Apple's 30% revenue sharing cut will soon realise that for the exposure and ease of use etc and I believe the sheer number of downloads we'll see, will soon jump on board. Thus the App Store will grow from strength to strength.
The way I see it is you could write the best, most useful Window's mobile app ever but you'd have to promote it, get it reviewed, figure a way to distribute it without people resorting to piracy, maintain ways to update it etc., etc. Or if it's written for iPhone/Touch submit it to Apple and for a 30% cut negate all the hassle and get maximum exposure. A no-brainer I think!