small hardware (pc, hub) for hidden pen-testing

I'm curious if anyone has had success using small form factor hardware
that will boot from usb (ie. backtrack or custom livecd) with a
network interface for times when you need access to a network (mitm, arp)
where physical access is limited and may need to leave the hardware behind.

I'm also curious of any self-powered (ie. usb, or ps2 adapter) hubs/switches
to attached to such small form factor hardware.

Trying to finding alternatives to leaving a laptop/(hub/switch) hidden somewhere
to remotely access a network.
--
offset

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