D-Link 8 Port Gigabit Unmanaged Metal Desktop Switch (DGS-108)
This is just a great all-around option that's easy to set up and use in pretty much any environment. It has support for Gigabit Ethernet connections, so it can work with just about any Ethernet port you have on your computers. There's a five port model that's nearly identical if you don't need eight ports on your switch, as well as larger 16 and 24-port models from D-Link functioning just as well as this one. This is an unmanaged switch so it's easy to set up and requires little administration to keep it running properly. The environmentally friendly features on this switch include power saving measures so the switch powers down any ports not in use or those connected to computers that are currently idle; this can potentially save you money while reducing your power needs.