Reeder - with the ability to add and organise feeds. Oh yes and the ability to post to tumblr.

Omnifocus - with automatic popup notifications when you are near a context for a task (e.g at the shops)

Ustream - able to use the front facing camera.

Momento - fix the bug that doesn’t update facebook and add the ability to pull in other feeds.

Tumblr - ability to set whether it notifies twitter/facebook. Fix the video upload bug. Send photos to flickr.

What about you? What iPhone apps would you like to see upgraded and why?