One of the more well-spoken developers who would like to see improvements in the App Store is Layton Duncan from Polar Bear Farm. His company is well-known for the Note Pad, Record, and Nice List apps, among others. Layton has used the Polar Bear Farm blog many times to express his ideas about how the App Store could be improved. Now he's started up a new website, ImproveTheAppStore.com, as a sounding board for all developers.
Layton asks that developers make suggestions to Apple through the traditional Apple Developer Connection channels, but is providing the site as a public forum for ideas. If you're an iPhone developer, join the movement.