Take a look at your bookmarks!

You will no doubt see that some of them have a little icon, usually the logo of the site, next to the listing. (see below)

This little icon increases your brand image before the customer has even clicked the link. In the past it was quite difficult to make these little images, not any more, check out the Dynamic Drive favicon generator (click to visit site directly)

This is a fantastic service, upload your logo (is best if it is square) and it auto-generates the logo for you. Look up at the address bar, our favicon was created with this service.