In case I forget, pet peeves should include something about antivirus products/firewalls and why I really dislike them, along with spyware detectors. Also diatribes against support personnel and shitty support. And how the devil should take both Flash animation, animated gifs, and embedded audio. Oh and blocking of pop-ups - which Opera does so admirably. Maybe a day by day newbie's guide to Opera or something, or outstanding complaints about the browser.
Product Activation and corrupt CD's (copy protection).