Here's how my modified ELM327 USB looks like... I used a 2-way ON/ON switch from Conrad Electronics (order nr.: 700978, or direct link). The neat thing about this switch is that it's super small and if you happen to have a bluetooth version of the ELM327 (the el cheapo one, anyway) then you can fit it even nicer on the side. The casing for the bluetooth is identical to the USB version and they've used a plastic cap to cover the hole where the USB cable normally sits. That's a perfect fit for this rocker switch.
Btw. if you own an Android based smartphone and have bluetooth on your mobile computer, just go for the Bluetooth version and try out the Torque app (on Android Market/Play Store). This way you can make even more out of the already cheap device.
Two photos:






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