uploads & reorganizing general: want to have an Ask blog uploaded but don’t have the time to do it alone? do you want help to check if every Johnjoseco image is uploaded or any were missed? need to retag 1,000 images because of a policy change? launching any such initiative would go from here. You could also check if there is anyone else is already working on the same thing you are.
If there was sufficient demand, I or someone else could write a piece of software to do such operations automatically using the API. Certainly automated retagging would be easy, and bulk uploading from tumblr or DA shouldn’t be too much harder. Of course, automated tagging during bulk uploading would be a bit harder, but you could just set a default set of tags for the entire upload and then sort out the details later.