I'd think any basic drawing or mechanical CAD package would do it for you.
I used OpenOfficeDraw to do my last layout (and schematic). It's a little like Visio.
Then there's KiCAD - a free schematic/PCB tool (see the thread in the Computer-Related subforum). The schematic tool has the advantage that it will spit out a BOM and a netlist/wirelist if you talk to it right.
I guess I'm having a problem understanding what you're really looking for/want to accomplish.