Back before vacation, I was pointed to Sxore by Brad. While I believe in identity concepts, something closer to OpenID/TypeKey/etc. more what I think works. Sxore’s implementation pulls comments off of my site—I just tested it out—and that’s a deal-breaker. I own the comments on my site, and they should be on my site. Sending users elsewhere? No thanks!
I do want to thank Weston Triemstra of the Sxore team for answering my questions and walking me through it. If you’re interested in this, he’s the guy to talk to.