Enhancements to the current design could include miniature cameras, microphones, communication devices, and chemical micro-sensors. The size of these devices could make them useful for getting into tight spaces and bringing back data to solve various problems. The robots were initially developed with just wheels, but the wheels were made into treads which now allow the robots to move freely over carpeting. Read more at Sandia.gov . This is definitely a fun little device that could be used potentially for good and bad purposes.
Surveillance immediately comes to mind.
This particular use of the device isn't currently very feasible, as it only contains a temperature sensor and no way to report data back to someone remotely. Uses of the devices that have been outlined are detecting chemical weapons and locating and disabling landmines. The article talks about using many of the robots in swarms that work together. I could imagine that there would be a lot of uses to such activity, such as mapping out terrain or taking general temperature or chemical readings over many areas at once without actually being there and setting up 1,000 sensors. Just dump 1,000 of these babies in the terrain and let them wander about until you have the mix you want.