A short vid as an intro: http://www.euronews.net/2012/01/25/protesters-in-poland-angry-about-acta

My synopsis of how it came to this from Monday: http://news.ycombinator.com/item?id=3502200

That EuroNews footage above is from Tue.

Here's some footage from Wed, when protests escalated in multiple cities:

http://wyborcza.pl/51,75248,11032507.html?i=1

http://kielce.gazeta.pl/kielce/10,88276,11032670,Manifestacja_ws__ACTA_w_Kielcach__Jeszcze_pokojowa.html

http://krakow.gazeta.pl/krakow/1,35798,11032507,Manifestacja_w_Krakowie__protest_przeciwko_ACTA.html

http://www.tvn24.pl/-1,1732237,0,1,zhakowany-sikorski-i-goracy-wieczor-na-ulicach,wiadomosc.html

It's also a good idea to search for "acta protest" videos on YouTube.