I can recommend ExpressPCB, PCBExpress, and Sierra Circuits ProtoExpress ( http://www.protoexpress.com/ ) here. ProtoExpress, in particular, was pretty good in terms of price, specs (minimum trace/space, hole size, ability to do 4-layer boards), and turnaround time. If you want to do something super-simple, ExpressPCB (http://www.expresspcb.com/) is a PCB prototyping house that has their own free Windows CAD tool you can use. You can only use designs from that tool with them, but they have at least been around a few years, and should suffice for many simple, low-volume projects.
