I gave the developer preview code a run today, and all my hopes as to what Diaspora could be died. It took too long to produce so little that everyone's outrage at facebook's privacy has been compartmentalized into a hollywood movie on the subject, and thus rendered irrelevant.
To be a seed you are going to need a hosting provider that supports ruby on rails with a freakishly huge list of gem dependencies, that is also running the thin webserver - that's right it doesn't work on apache (parts of it worked, but most of the ajax stuff didn't because it requires the eventmachine interface). In fact, installing all the dependencies on an ubuntu server running a LAMP stack still required an extra 350+Mb of extra packages as all the ruby and mongodb dependencies, for a so far tiny web application. Talk about bloatware!
So although it may look good, it's been put together by crApple fanboys, aka morons. WTF were they smoking at burning man to make them think this was worth it? Gimme some of that sh*t!