[NamTaf]

For what it's worth, their iOS weather app is absolutely fantastic and I believe is now being aped or outright used by Apple in iOS7.

Small things, but it is a very nice user experience if what you're after is the weather.

[mirkules]

Sportacular for iOS is also great. Provides no-nonsense scores and news for almost every sport (I mainly follow basketball, tennis and soccer, though). It is a much better interface than what Yahoo's own web equivalent (sports.yahoo.com) has become.