Automatic submissions are made using specialized software or cgi scripts. It saves time but may not be as effective. Submission forms are not standardized and links may fail or be omitted. She says Yahoo is the most important with all others being a close second. A recent monthly count confirms why.
More people visit it then any other place.
The first step I take when promoting a website is adding a link at Yahoo. The results are displayed on your screen so you see if the link was properly indexed. With a tool like this it only takes a few seconds to submit a link to the major sites. It may be awhile before your link is actually included. Below are the standard index times.