Shiftworker is great if your a shiftworker 🙂
Flickr if you have a flickr account
Ebay for well ebay
Pandorabox for checking out free offers on apps
WordPress if you have a wordpress blog
IMDB for movie geeks
Angry Birds is good fun
MX Mayhem is ok game too
Sky+ for recording sky when you away from home
BatteryDoctor for battery tuning
As for everything else – it's all just downloading things for fun isnt' it? Nothing wrong with that, but I think the Application Store is all about downloading something, playing with it for 5 minutes, then discarding. And at 59p a pop who cares? That's the point of apps, not what they purport to be 'for'.
What? So you download any old shite then.