Thunderbirds was released in a 6 disc Blu-Ray set on March 17th 2009. Looks to be the same as the UK release, eg cropped to lose top and bottom of the picture. Price is $99.99 so I'm guessing that this set will be hard to find in the shops and not sell too many copies.

Sadly, its stupidity like this which could well kill future releases of older shows as the publishers will point to poor sales of "Flagship" shows like Thunderbirds when requests come in for Joe 90, UFO etc. It will be interesting to see how "classic" US TV shows like Star Trek are treated in this medium.

Anyway, if interested, its a 6 disc set, but no details yet on any extras, but its probably identical to the UK release.