The Propeller chip http://www.parallax.com/propeller/ is another embedded market chip in the same vein although nowhere near as many cores. Having something like this make for some interesting embedded designs.
Also, check the site for the arrayForth stuff.
On another note, it would be interesting if something like these existed in the 64-bit size. Larrabee is interesting, but if it was a simpler stack machine at around this price point then perhaps some work could be done on different ways to do parallelism.
I spoke to one of the Tilera guys a few years back about evaluating their boards for use in a telco project I was working on at the time, but gave up because I wasn't prepared to drop $15K on a development board just to evaluate it.
The technology itself was extremely interesting, though, and would probably have been a good fit for what I was doing. Also, the cost of the dev board included technical support and from speaking to the guy, I got the impression that they actually help you port your code to their platform.
Also, check the site for the arrayForth stuff.
On another note, it would be interesting if something like these existed in the 64-bit size. Larrabee is interesting, but if it was a simpler stack machine at around this price point then perhaps some work could be done on different ways to do parallelism.