The shared source licensing plan is very simple:
Some business must already have 1500 licenses in order to get the source.
IT depts. can look at it, but they can't modify it or share it w/ anyone. They just have it to "better understand the software". IT depts. can submit bug reports, but M$ can choose to ignore them if they want, which they will
When shared licensing finally goes into effect, it's going to be on the internet anyway b/c of some disgruntled IT employee.
If crackers had an easy time finding holes in the software now; just imagine if they had the source code. I mean, basically you can close your eyes point your finger at a random place in the source code and find a bug.
I hope M$ does release the souce code. Then maybe black market copies of debugged Windows will show up.