11. Flash
12. slow
13. horizontal scrolling
14. scroll within a scroll
15. desktop widgets that don't act the same (menubars)
16. broken Back button
17. slideshows
18. articles on 9 pages instead of 1 page
19. exposing private info "anonymously"
20. moving ads that require mouse yoga to hit the "X" 21. Can't tell what you do. Summarise your purpose.
22. OnMouseOver popups
23. Annoyingly low information density / short pages
24. Obscured prices
25. Restrictions on password complexity
26. 'Requiring' irrelevant information from me
27. Requiring a login for things that needn't
28. Spyware ("connecting to peopletracker.example.org")
29. Doesn't work well on a mobile browser
30. Not supporting deep linkingn+2: Tiny fonts. I can use a scroll bar, thank you very much.
n+4: pixel based layout that messes up upon (text only) zooming in
n+5: links made exactly like text