I personally don't care for authors telling me where to buy their books - unless they're not available from the mainstream sources (amazon, b&n, kobo, booksonboard)...
I hate it when they don't update their webistes in any kind of reasonable timeframe - so the "latest offering" is really two or three books ago!
I was stunned when I went to one author's website and her HOME page was her "about me" page, not her "about my books" page. Eek, but honestly, I really don't care to know that much about most of the authors I read, but I'd prefer to have a choice...seemed incredibly arrogant to me.
I'll add a +1 to the issue of not being able to find book lists (and reading order), of flash-based websites, of music blasting (especially if there's no way to turn it off).
I'd also say I'm always surprised (and a bit frustrated) when authors don't have descriptions of the books they're trying to convince you to try, or some kind of excerpt.