One of the things that are a great pain for me in Vista is the way to get to the Network Connections Screen. Although it's a small detail I think this is a real deterioration for IT Professionals who do a lot of work with network connections. (changing IP Adresses, DNS Servers, etc.) In Windows XP you could get to the IP Config Dialog quickly with a Double Click on the network connection - Now you have to navigate over the Network Sharing Center OR ....
you can use this command in the Search Field: ncpa.cpl (Source: http://blogs.technet.com/migreene/archive/2008/04/26/3045418.aspx)