certainly don't use autosubmitters
they claim to add your site to thousadns of search engines while you can get the same result by submitting to only ten major engines by hand.
sometimes mass submitting even get you banned temporary or permanent.
the best tool involving search engine placement is defenitaly WebPosition Gold
that prog has a constantly updated database about what all the major searhc engines want and how to get and keep you top10 spot for a certain keyword.
i once built a page with it that got number 1 on "free nude pictures" on aolsearch.
it costs $149 but it is certainly worth the cost.
oh yeah
url is ,
http://www.webposition.com