Jeff Warren and his loyal misfits at the Public Laboratory of Open Technology and Science are working on a low-cost DIY spectrometer. It's similar to some other diy spectrometer designs that the group has discussed in the past (i.e. Simon Field).
Basically it's a cheap HD webcam, a DVD-R fragment as diffraction grating, a dark box with a slit, and some nice open-source analysis software. (Light source not included.)
They have a nice diy build guide at http://publiclaboratory.org/wiki/video-spectrometer-construction and have created a nice website for capturing and processing the diffraction images from the webcam: http://spectralworkbench.org/. The website makes it simple to share spectral profiles, which could potentially help citizen-science spectrometry "go viral" :)
The source code for the site and analysis tool is all open-source and could be a good base for other biotech tools that could be made better with online sharing of measurement data (PCR...?).
They even have a kickstarter: http://www.kickstarter.com/projects/jywarren/public-lab-diy-spectrometry-kit.
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