Tomás, as someone who still is very much a newbie on testing, but comfortable filing bug reports when I find stuff, I'd like to participate in the testing, but want to know WHAT to throw at the test system. What bugs are you all looking for related to plack? Specific parts of the system? Regular tasks? What exactly does Plack change? Links? Behavior?
Give me some guidelines/direction, and I'll gladly pound away at it. Or if just generally walking through my own internal pre-upgrade testing list works, where we touch everything from basic circ to cataloging to holds to reports, I can just walk through that process, too.