The format is very important to me, and until yesterday I was getting the old format Kobo website, using Opera. Today it has changed, so I am no longer able to determine the format before buying. So no more buying from Kobo until it's fixed. Despite the 50% coupon.
Although I may have a (temporary?) fix. The NZ Whitcoulls ebook site is presumably still derived from the Kobo site, and it shows the formats available, but only for ebooks available in NZ.
http://www.whitcoulls.co.nz/ebooks/ebooks/45/
Does Kobo have resellers in other countries with their own websites?
Alternatively, IE9 is still showing the old Kobo web format. At least for the time being.
[correction: IE9 is showing a mix of old and new web format. In search results and in book descriptions some books show download format, others do not. For example searching for Gasston, Peter Gasston's book CSS3 shows epub format, but his The Modern Web does not show any format. And Whitcoulls only shows the CSS3 book. Aaaargh!]