Moving from Domain to Workgroup and back

Our company will be moving to another site in increments. Currently approximately 40 PC’s are connected to a Win2K server for business applications, a WinNT PDC for logon verification and an Exchange Server for mail. The first increment of 10 userswill be setup as a workgroup on a router/switch to share printers and a cable line for internet access. At some point in time I will need to move the servers to the new site and have the workgroup users rejoin the domain. The PCs are a mix of Win98, WinNT, and Win2K. Any suggestions as to problems I should anticipate?