I'm currently awaiting a hard copy of QlikView 11 for Developers but until it arrives I've been skimming through the e-book. A full review will follow when I've digested it properly but so far I'm quite impressed.
For those new to QlikVew it offers a step-by-step guide to building your first QlikView application and includes many of the most common obstacles and their solutions. And for those who've been working with QV for a while I guarantee you'll still pick up some useful tips and tricks along the way such as best practice and dashboard design.
You can get your copy (paper or not) from the publisher Packt http://www.packtpub.com/qlikview-11-developers/book or from Amazon http://www.amazon.co.uk/QlikView-11-Developers-B-Harmsen/dp/1849686068
Packt even have a great offer of 50% off when you buy 2 e-books so snap one up whilst you can!!!