Home-Brew Brain Computer Interface?

DeathToBill writes: There have been a few articles here recently about some up-and-coming research on brain-computer interfaces. There are even some consumer-level products out such as the Neural Impulse Actuator (£80). For the average geek who wants to mess with this stuff, they all have problems, though; either they are closed-source, with Windows-only drivers and no API documentation, like the NIA, or they don't even quote prices on their webpage, assuming that if you have to ask then you can't afford it (like the g.USBamp). Or they are aimed at people who have 10+ years research experience in BCI (which I don't have). Do Slashdot readers know of any projects out there that bring brain-computer interfaces within reach of the geek-experimenter?