Simon Willison discusses a neat method for dealing with the internet password problem: The bookmarklet solution to the password problem.
Personally I’ve have a small set of passwords I use for many of my internet accounts. Its hard to tell at the start of use whether an internet account might become important. Then laziness dictates that I don’t replace them at a later stage.
This method for generating a “unique password” which is easy to remember for each site is an excellent method for increasing overall security.