Google cares about
quality links. Yahoo and MSN are less picky about links, but that means that you need
quantity links to win in those search engines. And, of course, those links need to have good anchor text.
One easy way to get lots of links with good anchor text is to write articles and then
submit your articles for publication on other web sites.
Another useful tool for building massive anchor-text links is the
DigitalPoint Co-Op Advertising Network.