RoboRoach

More recently a small team of engineers at a Texas university have developed a system to remote control cockroaches with a miniature computer. The way it works is by actually connecting to their nerves system via small wires that output extremely small electrical signal which stimulates the nerves that correspond to their antennae. Since these bugs almost entirely base their movements on the sensory input from their antennae it is quite effective. Essentially whenever they hit something with their antennae it means they've hit a barrier and have to get around it. By using this simple fact they can be coerced into turning on command. Combined with a tiny chip with a bluetooth receiver simple turn left or turn right commands can be transmitted with most smart phones.
While cockroaches are agreeably disgusting this could allow for some real applications such as disaster response as these tiny bugs are particularly good at getting into all sorts of tiny hard to reach areas. If several are connected to a tiny microphone with a noise filter they could be used to locate victims in events such as earthquakes. The only major current issue is that the added weight tires them out more quickly.
However, while they may just be cockroaches another important question is whether or not it's right to do this to any organism. While it isn't mind control it's most certainly manipulation and mutilation as the "installation" process requires that a large chunk of their antennae be cut off to allow the wires to be inserted. Essentially afterwards while it can function afterwards it will have a temporary or possibly permanent state of impairment due to the complete lack of antennae. Although I think most people would agree that if something as vital as disaster recovery can be accomplished then it is a worthy sacrifice; especially considering that many many are killed in insecticide testing every day.
Furthermore other interesting applications could possibly be 'bugging' only slightly more literally. Given the use of a tiny microphone, provided the audio is of high enough quality, surveillance could be accomplish and since cockroaches are capable of living in nearly every inhabited continent it could be a feasible application. Other uses could be further study of the nervous system through direct manipulation. In any case it seems like it could present some very interesting application opportunities. Additionally, while I can't imagine having to interact with them wouldn't be everyone's cup of tea, it is currently available for purchase for use; though it is quite expensive.

sources:
http://rt.com/news/237605-cockroaches-rescue-robot-computer/
https://www.youtube.com/watch?v=3dftWoHldXs