Yesterday, I attended a mini-seminar on Search Engine Optimization (SEO). This is not my favorite subject as a rule since I tend to believe that a well-designed site (coded to standards) with valuable content will always bubble to the top.
That said, a co-worker of mine who also attended the conference said she was annoyed by search engines and their rulesets (i.e. not reading flash, preferring properly coded HTML, favoring content at the top of the page, etc.). She said that search engines were making sites conform to their rules and therefore making the web less interesting.
I don't really agree with her since they are saying you can do whatever you want in your site, just don't expect people to find you if you don't play by our rules. Personally, I think giving up some freedom for findability is a fair trade-off, but I thought it was an interesting point of view.