I'd love to know what the upcoming services will be that will be included in SocialThing. A suggestions page would be nice. I'd like to have the option to include my friend's blog/RSS feeds (though as there is no "central" blog-SN, it makes things trickier, I agree), Seesmic videos, del.icio.us links, Google Reader Shared items.
Are there technical constraints preventing you from adding them, or is it just that it takes time? Would be nice to know what's in the works, what's not going to happen, etc.
Socialthing is damn nifty. I would suggest having the text in posts re-flow, so as to be able to have a smaller/thinner browser window without having to scroll horizontally to read text? Socialthing technically doesn't take up a lot of horizontal real-estate, and it would be nice to be able to leave it open as a thinner column of posts, a la the iPhone interface.