http://feeds.sciencedaily.com/~r/sciencedaily/~3/nAR4eHts4tA/090528093004.htm

Science Daily wrote:

Imagine being able to detect in just a few minutes whether someone is infected with a virus. This has now become a reality, thanks to a new ultra-sensitive detector. The first prototype has just been completed and researchers expect to be able to introduce the first version of the detector onto the market in late 2010. Not only does the detector carry out measurements many times faster than do standard techniques, it is also portable, so it can be used anywhere.

Not quite a tricorder, but this is still quite fascinating.