Integration with a site-wide image-management interface that stores images in the content-repository tables. (Does anything like this exist yet?)
Heh. I wrote a basic image-management package at aD. Its main advantage is making it easy to include pictures in other packages and get administration of them 'for free'; it doesn't do much interesting stuff with the images themselves (though it does generate pleasingly low-bandwidth thumbnails). It's called simple-pictures and it's part of my leftover ACS stuff. There have actually been a few bugfixes recently, I'll upload a new version to that page soon.
Making it use the content repository was something I never got around to doing...
