The new redesign of Amazon's Audible site was pretty good. Their cancellation process made me want to murder them, so I guess it was a mixed bag.

Disagree! While eBook typography is a gimme — can’t disagree there — Amazon.com is one of the most usable sites out there. Sure, Krug’s book Don’t Make Me Think is a bit old, but there’s a reason he kept using Amazon as an example of whom to copy. They have good UI design because they had to in order to win online commerce. Flows like reporting problems with orders are very well thought out and guide you to the proper next action, whether you are starting from the the page of the product you ordered or your account history, for example.

Similarly, I don’t know anyone who is very confused by Amazon property IMDB.

Amazon.com search may not be as good as Google’s, but it isn’t the worst thing ever. I will agree they still need to work on relatively basic things like spelling correction. But remember A9? Amazon have certainly invested in search. And certainly their book search is worlds better than GoodReads’ is! Basic things like "hitch-hiker's" vs "hitchhickers", IIRC, have tripped up GoodReads search, but don’t make as much a difference on Amazon.