Ok, now that final version of Reactor 4.0 is out, I can post my solution to crackme (hxxp://www.mediafire.com/?rtdnnxyjmoj)..
There are some changes in protection code from 4.0beta to 4.0final but they are not that important. Approach used in my solution still works.
I did not write a full tutorial and most likely never will. The guys who already know how Reactor works don't need a tutorial. The guys who don't know should study it themselves.
Have fun,
kao.