New Scientist article describes how an inkjet printer can be used to homebrew printed circuit boards. There's every indication that inkjets have some pretty powerful applications; we've already seen inkjets that use edible inks to print high-res photos on sheet-cakes, and inkjet "Napster-fabbers" that lay down layer after layer of goo that hardens into a 3D form of your specification.
The researchers have so far used the technique to make simple organic LED arrays that display images when connected to a power supply, as well as power-generating solar cells. But Jabbour believes the technique could be used to create many different types of device.
This flexibility comes in part from the ability to print semi-conducting polymers on many different surfaces, he says: "We have put them on to textiles, silicon wafers, plastic, glass – you name it."
(Thanks, Bill!)