This is a very good quick primer for the basics of the HERO system. It is quick and concise, I would find it very useful to hand out to novices and at a convention with pre-generated characters to help explain the rules to them. It has a very nice clean layout and is clear in how it explains what things are relative to other things.
As an example it explains Talents as sort of a Power lite.
As a free item you cant beat the price, and it is great for reducing the things that you have to remember to book mark/ copy for new players.