The Whitcoulls site is awful, especially when accessed directly from the Whitcoulls application. I started using the kobobooks ebooks site (http://www.kobobooks.com/
) to browse or search for books of interest, and then using the Whitcoulls application to find the same book by searching.
One serious problem with the application is that you can only buy a single book at a time. You have to enter all your details for every book. Unless you trust them to store your credit card information permanently. Which I don't.
During a call to the Whitcoulls helpdesk after not being able to access the store at all from the application, I learned that you can actually buy the ebooks using a normal browser from their web site (http://www.whitcoulls.co.nz/ebooks/ebooks/45/
), by logging in with your normal login information. The ebooks you buy there will then appear when you start the application and sync with the reader. This also lets you buy more than one ebook at a time.