If you have an Amazon account, get the market place app. It gives a charged app for free everyday. A lot of otherwise paid apps you can get for free, which a lot can be very useful.
There's Sports Tap - good spots app for scores. Pretty up to date.
Sound Hound or Shazaam - Music reading app. It will tell you what song it is just by hearing it.
Pandora Radio - Radio streaming app. Might suck more than it used to, so there are other alternatives like Spotify or Grooveshark
Can't think of anything more at the moment, but there is almost an unlimited amount of useful apps, you just gotta dig for them.
There's Sports Tap - good spots app for scores. Pretty up to date.
Sound Hound or Shazaam - Music reading app. It will tell you what song it is just by hearing it.
Pandora Radio - Radio streaming app. Might suck more than it used to, so there are other alternatives like Spotify or Grooveshark
Can't think of anything more at the moment, but there is almost an unlimited amount of useful apps, you just gotta dig for them.