Ten apps is all I need - (37signals)
I disagree. I regularly use a bunch of non-Apple apps e.g. offline Wikipedia, iBird, oMaps, Topo Maps, Evernote, MobileRSS, BlogPress, TripIt, Photoshop Express, Yelp, Facebook, Twitter, SmartGo. *
I agree no one needs hundreds of thousands of apps. But you need a large selection in order to find the ones you want - you need the long tail. It's the same problem when you try to reduce the number of features in software. Sure, no one person uses all the features, but different people use different features.
The popularity of the platform draws the developers that you need to get the apps you want.
One of the big things that would stop me from using another phone or tablet (e.g. Android) would be the availability of the apps that I want.
PS. I'd also disagree with listing the Weather app as one that Apple "nailed". It's very basic and I don't find it very useful. I believe it's getting updated in IOS 5.
* A number of these I use because they work offline. Outside Canada, or even out of town, I don't have constant connectivity.