How will OpenID change your site?
Peter Nixey, explaining one of the pitfalls of picking up new users:
So you’ve built an incredible new service and spent a fortune advertising it on Google to get maybe a thousand clickthroughs. Of those, perhaps a hundred will be impressed enough with your service to reach that critical sign up screen. Ask the user for a username and password, confirm their email and you’ve just lost 75 of them.
I can think of a few websites I never tried simply because I didn’t want to create another username and password, so I think this article makes a decent case for wider adoption of OpenID. For now, though, I’m off to Wikipedia to read up a little more on this…