(moderator note: this reply was originally from berkinet, but it accidentally got removed)
Well... I usually mount small boards etc on a plywood backboard. Make it as big as you can. But, 3ftx3ft (1m2) is a nice start if you have the space.
Then you can do a number of things. There are several products like this one from Belkin:
or
But, those might be a bit large for your needs. So, take a look at the installation hardware page from
sandman.com. Scroll down to the Mushroom Screws and look from there to the Bridal Rings. (Lots of cool stuff on this page.) Essentially you take something like a mushroom screw (Wide end out), drive rings or bridal rings and create a matrix around the edge of your back-board, and maybe inside as well.
Another option, which I like, is to create a cross-connect system. Terminate all sensor and digital I/O wires (not Ethernet) on a split 66M block and then continue the wires from there to wherever. (See 66 Block Types on
this page). This is probably a bit more complex than you want - you'd need the blocks, bridging clips and a punchdown tool. But, it does make for a nice neat installation.
Also, I'd suggest posting this question on the
General Home Automation forum. This issue is not unique to Phidgets and people using other technologies and products may have applicable solutions.