EDIT: also take a look at separate take at it—there is more information there.
I would suggest to watch the first one and, if it makes you curious, one of the long ones since there is quite some overlap between them.
Po polsku z realnymi przykładami: moje wystąpienie na Product Tank Warsaw https://youtu.be/ypiZml3mHfo.
A short introduction for everyone (TED style, 15 min. long): www.youtube.com/watch?v=kOfK6rSLVTA
An introduction for agilists (conference presentation, 1hr long): www.youtube.com/watch?v=70KE8FDT32Q
An introduction for Software Architects (conference presentation, 1.5hr long): vimeo.com/user22258446/review/79092608/600e7bd650
There is a lot, and I mean really a lot, of information on gilb.com, especially in the
(In Polish) Kontrowersyjnie zatytułowany keynote wygłoszony przeze mnie na ABE Light 2015.