Lookwork RSS Reader seems to be the reader I have been waiting for: ALL VISUAL, built for artists and designers. Lookwork creates a flood of images built from your RSS subscriptions and lets you create a personal library by tagging the images you want to keep. You can backup your data via Dropbox and follow others. Now if only one could try it with my own feed without having to subscribe for the $5/month right away. Bummer.
Update: The folks of Lookwork told me via Twitter that they are going to introduce a 7-day free trial soon! YAY!