One of the benefits of Dataportability is that it makes it easy for you to sign up/in to sites. It’s difficult to see why anyone would get excited about something that on the outset is very geeky to get your head around.
Now, take a look at this site: Rejaw
Nevermind that it is YATC covered by Techcrunch here, just revel in the user experience of signing up. It’s quick, simple, no frills. Doesn’t ask too much of you, but gets down to business. I couldn’t care less about the actual service, but the Entry Gates are fantastically awesome.
Majordojo writes that it’s “An OpenID-powered registration system I actually like…“. I’m not going to copy and paste the entire post as they did a pretty good experience path on it already. So just clicky the link 
I think the best part is the Facebook Friends part. When Facebook Connect launches we’ll see that this entire process is going to be MUCH smoother. I found Stii on Rejaw thanks to this tool.
This is what signup to your site should look like. We need more people doing signups like this.
Other sites that have a pretty cool signup:
Try these guys for size when it comes to simple sign-up: http://posterous.com/ – plus of course validation of email all included in the mix..