In and of itself, there is nothing wrong with trying to better your ranking with the various search engines. You can play with META tags, page content, whatever you think will boost your relevancy. Before you do, however, I think you should put some thought into whether or not your site is going to live or die by search engine rankings. Sometimes I think there is too much emphasis placed on playing the search engine game. When you identify this, I believe you should shape your content and presentation around it.
People venture onto the Web for lots of reasons.
One of the major ones is information. If your site is just a collection of links or a thinly veiled way to hawk your goods, I think you should seriously consider developing some content that sets you apart from the crowd. If you're selling products or services, show how your item is different that the rest of the world's version. Articles, tips, tools, tutorials, and other resources to help you effectively design and promote your site. Yes, it is possible with a little work and with the help of WebPosition.