OK I hear you thinking what an earth is he on about images bringing more visitors than people coming from keyword searches??? well its very simple but often overlooked
Both Google and Yahoo have a service where you can search for images rather than keyword web searches , many people overlook this as an important opportunity to get there images listed in the image search
You do not have to do anything special to get you images listed just follow my previous posts and make sure you name your images and use the ALT tags with relevant keywords and phrases, again we will use the border collie web site as an example
On a page we have a picture of a border collie ,
The image is called black_white_border_collie.jpg
the Alt tag uses the description black and white border collie
When someone searches the web for black and white border collie your web site might not come up on the first few pages BUT if you search the images for black and white border collie your web site will more than likely come up much earlier
Ok so your pictures are ranked high in google so what? well if you use the image search you will know that as well as looking at the images you have the option to go directly to the actual page that the image is hosted on "YOUR SITE"
You will find some advanced searchers and just curious people will follow on to check out your site if the image they find in google is of interest to them
Its very simple and often overlooked