>I would like to obtain a tool that will help me synchronize my laptop based on a set of directories I have on my PC. Basically, it is not about copying each time the entire directory structure. I am looking for something that will only copy the updated files, the new ones and remove the ones that no longer exists. Is there such a tool somewhere? If I could have something in .NET, that would also be interesting.

Couple of things to check out:
http://msdn.microsoft.com/en-us/sync/default.aspx
http://www.microsoft.com/downloads/details.aspx?FamilyId=E0FC1154-C975-4814-9649-CCE41AF06EB7&displaylang=en
http://sync.live.com/
http://social.microsoft.com/Forums/en-US/synctoy/thread/e55d4af2-e228-4846-a690-44f10d5144b6