National Insruments (Score 1)

National Instruments (www.ni.com) makes all sorts of digital aquisition and metering products. I've been helping with a setup that measures irregularitys in stamping presses. They have a very compreshensive set of products, and they support Linux! (and windows, and Macintosh and HP/UX, among the others).
This stuff is mighty pricey though. The digital aquisistion card's run in the USD$1500 - $6000 range, and THEN you need a breakout box to plug your sensors into.
It's some pretty neat-o stuff. Expensive, but very nice.