You don't necessarily click on the top two or three. You click on the one with a title that appeals, that sounds useful or interesting. Make sure your important keywords are used more than once one on the page you're submitting to the search engines. Some of the major engines will rank your site based on the relevancy of the keywords used. And the same for your competitors site with the same keyword.
Many professionals list their keywords as many times as they possible can throughout their site.
One way of doing this is to list your keywords several times way down at the very bottom of your page where no one is likely to come across them. It might take your page a few seconds longer to download, but think of all the extra hits you'll receive. I keep reading that search engines now penalise sites who repeat their meta tags or keywords too many times. But when I search Alta-Vista, in the make money internet marketing field, the number one site repeated them 8 times. And in Infoseek the number 2 site repeated all the meta tags 7 times.