It would be useful to have a simple editor like TinyMCE but with image browsing/uploading plugin that doesn't just provide you with a file system interface. Instead it would be more useful, IMO, to have a database backend powered images table that you can search through via autocomplete/tags that you can give to each image when uploading it. It would also be useful to have a module in that plugin to search flickr and other services images for CC friendly images that you can transfer to your site easily - retaining all the authors info (to be displayed next to an image).

Actually I have this in my TODO list somewhere down the road.