I've made some customizations to OpenID selector code (
http://code.google.com/p/openid-selector/) and combined it with MediaWiki
OpenID extension, you can see the result here:
http://www.sharingbuttons.org/Special:OpenIDLogin
Iwant to check it in back into the repository, but it uses "New BSD License"
and I wonder if it's OK to do so.
Otherwise I'll write one from scratch and GPL it.
Sergey
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Sergey Chernyshev
http://www.sergeychernyshev.com/