Two further requests for images:
1. The ability to rename images *and* update all the references to them. Far too many people upload "Washington.jpg" or something cryptic like "HghHfnr1.jpeg"
2. don't use the file extension as part of the identifier. In other words -- allow an upload of "foo.PNG" to replace "foo.JPG" this would mean using [[image:foo]] only for links.
We've done it like this on UnrealWiki, it's handy for when people use the wrong format (eg JPEG for a line diagram)
Lastly -- is the idea to have a common image space across all languages still on the cards?