It will also fill in forms for you. When you are at checkout, you have to fill in your shipping and credit card info. Multiply that by the number of sites you visit and you will see it's a real time saver. Microsoft is trying to create something like this called Passport. Unfortunately, Passport only works on Passport authorized websites.
Gator works on all websites.
You gotta try it. Gator remembers your passwords for you Get Cash Back on your Web purchases . These are just now becoming popular. It's a pretty straight forward concept. Most sites are now offering 'affiliate' programs which pay referral fees for links from other websites.