Are you planning on implementing any new features based on stuff tumblr natives will expect? I'm thinking particularly of tag blacklisting, which is really important to a lot of tumblr users.

I'm also curious about Dreamwidth's stance on reblogging. I don't think it's necessary if people actually use communities like they used to, but even after a short amount of time on tumblr, I'm finding that coming back, it's harder to make decisions about what belongs on my personal journal, and what to post in a community. Having the ability to reblog certain posts (determined by the OP, like pillowfort is doing) might bridge the gap a little, although it would also fundamentally change the way some people use the site, I'm sure.