Some time ago I had this idea...
Could it be possible to have an image uploader, that would accept a large version of the image, which it would than resize to some value specified in options (lets say 350 pix). The uploader would then offer to insert code for the small image, linked to the original, into the post. Or allow you to link the big one directly.
I understand this could be done either with some library like netpbm, imagemagic... or directly via php.
It would make my day.