While not the first wall climbing machine we've come across, Vortex's VRAM Mobile Robot Platform (VMRP) machine weds ascension and undercover surveillance in fine fashion. Aimed at law enforcement tasks, military missions, and fanatical hobbyists, this clinger is remotely controlled with the capacity to add "onboard intelligence and sensors to monitor VMRP status and health." It utilizes a vortex vacuum to suction itself to vertical surfaces, and then relies on the wheels to get it movin'. Moreover, this bot was built to withstand mild weather hazards and communicate wirelessly back to the user, and its ability to wield microphones, video cameras, and proximity sensors make this the ultimate eavesdropping tool. Sadly, we've no idea how much it'd take to get one of these in your needy palms, but free free to indulge in the video waiting after the break.