I keep forgetting this:
When logging in to CodePlex using TFS, then you need to prefix your username with “snd\” and suffix it with “_cp“.
So if your CodePlex username is wiert, then your login becomes snd\wiert_cp.
Somehow, this used to be more prominently on the codeplex site, but it isn’t any more.
–jeroen
via: TFS2010 « Ahmed Al-Asaad’s Blog.
The Wiert Corner - irregular stream of stuff 