10 Web Usability Lessons from Steve Krug's Don't Make Me Think

Don't Make Me Think is a book by Steve Krug about human-computer interaction and web usability. The book's premise is that a good software program or web site should let users accomplish their intended tasks as easily and directly as possible. Wikipedia

A Summary for the Book

10 Usability Lessons

Update:
I found the whole book online here if you are interested in a Free copy