Much, much later, but I had to comment saying this would be really wonderful, yes. I use Twitter and Tumblr, I like their interfaces a lot and don't particularly want to shift that activity back to DW directly, but I would dearly like to be able to use DW as an archive of my online activity elsewhere because in terms of digging through archives, I'd much rather do that on DW where I know the infrastructure far better (and the infrastructure is much, much better designed for digging through archives, anyway!).