TFS out of sync between local and remote - how to "re-sync"?

The easiest way is to exploit VS 2008's "online" feature. Basically you want to set your solution offline, then bring it online while connected to the proper Codeplex server. TFS should figure out the rest.

• Feature overview: http://msdn.microsoft.com/en-us/teamsystem/bb898913.aspx
• Tweaking the settings by hand: http://blogs.msdn.com/benryan/archive/2008/07/09/using-tfs-2008-power-tools-to-modify-server-s-offline-state.aspx

To compare local and server folders, you can check out TFS Power Tool. After installing it, you can bring up the source control explorer, right click on the server folder and then select 'Compare'. Folder difference window will display the differences. You can also right click on the differences to see available commands such as 'Get Latest' to update your local folder for example. Check out Bryan Harry's blog post on the power tool