This scenario comes up quite a bit in the chemical industry - IT management of remote offices where the number of people in the office is low. We recently released a case study with LaFarge North America on how they approached this challenge using Windows Server 2008. LaFarge NA is a leading construction materials supplier in the US and Canada, and they have 1,000 locations - 600 of them with less than 10 people.
They took an interesting approach to network security in the branch offices by using freed-up servers from their data center consolidation, and deploying server-core and a read-only domain controller for the branch offices. The server core can run on these "old" (3-years old) servers deployed out to the branches. This creativity is going to save them $400K over 3-years. Not too shabby.
If you have a similar scenario in your environment - take a look at the case study.