Popularity is the product of two factors: (a) how compelling material you offer, and (b) how easy it is to access it. Host free pirated movies and users will flock to the site, even if it's difficult to use.

The system should always keep users informed about what is going on, through appropriate feedback within reasonable time.

Diversity is power on the Web. Big sites may be bigger, but smaller sites will keep scoring higher for specialized topics, both in terms of their connections with users and in terms of each visit's commercial value.

If your users have many questions, it's a failure of your primary site design. It becomes not so much customer support, as much as customer complaints.

Users spend most of their time on other sites. This means that users prefer your site to work the same way as all the other sites they already know.

Inadequate use of usability engineering methods in software development projects have been estimated to cost the US economy about $30 billion per year in lost productivity.

Compared to 1999...we cannot quite declare victory, but we can declare progress.