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First off, I thought the exam was really well written and had very practical real world type questions. This is good exam for people who have been working in the wireless field for a while. It has lots of screen shots from typical tools in the wireless engineers toolkit. Having said that, it makes it tough for somebody who wants to rely solely on the CWDP book to pass. As matter of fact, even if the exam was open book, it might only get you by on 50% of the questions. Some things I would advise people reading a few times before even attempting the exam:
1) Chapter 3 CWNA book: dB Math. You should already know this inside out by now.
2) Chapter 4 CWNA book: Antenna Concepts, You should know this inside out.
These Cisco documents are also helpful
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008008883b.html
http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/prod_white_paper0900aecd806a1a3e.html
4) Chapter 11 CWAP book: Spectrum Analysis. If you are not using some sort of Spectrum Analyzer day to day this chapter is a must.
5) 802.11n Videos on the CWNP website.
6) Chapter 10 CWDP book: QOS! Whatever you can find on QOS in wireless I would recommend reading or head over to Keith Parsons wirelesslanprofessionals.com. I would recommend listening to all the podcasts, but the End to End OQS with Devin Akin and Voice ones are a must.
7) Read the CWDP book a few times. I had it on the kindle and it didn?t seem to be as daunting of a read when you can?t tell how heavy the book really is.

Hope this Helps!

Great advice, I have replicated your post into the CWDP study group on Linkedin.

Thanks,

NM