Obviously you can go to the Qlik site and get inforamtion from there. There is also a demo portion of the site where you can see and play around with developed applications.
the link above will take you to a google page with some good sites to go to. Alos, if you red the gartner magic quadrant reports, it gives QlikView high marks and discusses both strength and weaknesses
on the right left there are links to webinar, free training, video library
read all doc of
if you want to buy a book
qlikview 11 for developer
some interesting blog