As a child I remember asking my Mom why the sky was blue and what was up with zebras and stripes. Now that I'm a little older... I often find myself wondering about a browsers support for JavaScript expression(...) and if DOM objects can be clobbered.

So... if your momma isn't around - there is an awesome document hosted on Google Code written and maintained by Michal Zalewski. It contains the secrets of the universe a gonk-load of useful information for the aspiring to advanced developer.

Truly - if you want to create a premium experience it would be good to have your bookmarks set accordingly...

Browser Security Handbook - Part I
Browser Security Handbook - Part II
Browser Security Handbook - Part III