Just a note to let everyone everywhere know that today, Nikon has introduced the D700, which is it's "midrange, semi-pro full-frame dSLR." To my eyes, that means "expensive, full-frame D300."
Naturally, having bought my D300 less than a year ago, I am very slightly miffed. But the reality of things is that I probably would've spent all that money somehow anyway (surplus automobile?) and that I really do like the D300, even though all my friends who have Canon 5Ds are rockin' the full-frame sensors.
Of course, the rumors say that there's a Sony Alpha 900 in the works, which is purportedly a 24 megapixel camera with a full-frame, working at a fairly respectable six frames per second, which would probably make it the fastest camera of it's kind. The killer part of the Alpha 900 rumor is that the whole thing is supposed to cost less than $2000. I think some numbers have been tossed around at about the same cost as the D300.
Ouch, Sony. Ouch.