I have been keeping an eye on these bluetooth location stickers and they just announced that they were able to include a thermometer in with every unit... which of course made my mind jump right to fermentation or use in a keezer. I think if you were to stick one on the side of your bucket/carboy or were able to waterproof one and drop it right in it could make life much easier for a quick temp reading and possible logging... and I suppose if you lost your bucket you would be able to find it easier too
http://www.indiegogo.com/sticknfind/x/1045302
http://www.indiegogo.com/sticknfind/x/1045302