Indeed, there is a painful lack of sites willing to consume an OpenID for authentication. (I
agree that it would be a marvellous feature for LWN to do so.)
> So far, though, other than the LiveJournal [...] and Digg,
If Digg accepts OpenID logins, I can't find it. The only login form on Digg that I can find
demands a username and password, as before.
> there just aren't that many sites where OpenID can be used.
The <https://www.myopenid.com/directory> OpenID Site Directory lists many sites and services
where you can log in with your OpenID.
It's harder to retrofit OpenID login to a site that has already built its authentication
system around usernames and password than it is to simply build it in from scratch to a
service while developing it the first time. So the sites that were *already* popular before
OpenID became popular will have a much harder time integrating OpenID login, and so will be
slower to adopt it.
Some existing services that have taken the plunge anyway include <http://pastebin.ca/> general
pastebin, <http://plaxo.com/> Plaxo, <http://technorati.com/weblog/2006/10/144.html>
Technorati, <http://www.wikitravel.org/> Wikitravel.
The result of this is that many of the best OpenID-login services are those that were built
around the time OpenID was being promoted (and thus are younger and less well-known than
comparable services): <http://ma.gnolia.com/> Ma.gnolia, <http://www.simpy.com/> Simpy,
<http://pibb.com/> Pibb, <http://moodstr.com/> Moodstr, <http://jyte.com/> Jyte,
<http://zooomr.com/> Zooomr, <http://micropledge.com/> microPledge, <http://issuesdone.com/>
Issues Done, <http://www.ticketeverything.com/> Ticket Everything.