Counters may be good advertisements for pages with many visitors. Otherwise, they are either of limited use or an embarrassment. Access logs are a much better way to monitor traffic, if that is your goal. Use browser-specific features with caution. Browser-specific HTML tags or other tricks will annoy those readers who do not share your particular browser preference.
Frames can easily cause problems if created incorrectly.
Frames are best used with great care, if at all. Frames can be useful for certain presentations such as indexes or tables of contents. However, improper use of frames will frustrate users and confound search engines. Be sure to consult a good tutorial if in doubt. Blinking text, marquees, or animation may easily be overdone.