I keep meaning to tell you... ReBirth is free now.
That news should be of interest to anyone making electronic music at their computer, though it's old news and those people probably know it.
Rebirth doesn't work so well on OSX, so Mac users will have to keep an OS9 partition open to run it. (Or simply buy Reason 3.0, and download ReBirth as a Free ReFill for it. ...which does add $500 to the price, but who cares? It's free!)