VS2010 and TFS credentials

VS2010 for some reason doesn't save TFS credentials if you connect to the TFS server. Under Win7 there's a trick that you can use to fix this:

Open up the user credentials (this is for Windows 7): Control Panel\User Accounts and Family Safety\Credential Manager
To the right of the Windows Credentials title is "Add a Windows credential". Click that link.
In the "Internet ro network address (e.g., myserver, server.company.com) box put: tfs
In the User name, put: DOMAIN\username (your username)
In the password, your password.

The whole description is here.