Well, in my case
2 trackballs
2 USB extender cables for running plugs to the side of the cabinet.
PS2 converter
2 U360's
IPac4
3 LEDWizs
USB Spinner
Flightstick
2 PS3 guitar hero wireless guitar controller adapters
(and likely a drum adapter before I'm done)
And I'm experimenting with using a couple of those 1" photo keychain things that's USB connected for showing slide shows on screens embedded within the CP, but that's another project too.
But yeah, I'm probably an edgecase
