BT5 ARM? Is the Raspberry Pi invited to the party too? (I mean, I'd expect so, but I only see smartphone threads in this section so I thought I'd ask.)
The RasPi could be a pretty handy tool if paired with BT -- a super-customizable BT card which you could place in seemingly benign containers/locations for gathering data.
Or, y'know, just get a bunch of them spread out over some area and get exceptional wireless coverage, command your own team of nodes, etc.
Oh, yeah, this has to be a thread. Let's discuss any creative uses we can come up with using Raspberry Pi boards/systems and BackTrack.