The most important part of SEO is off the page factors, but for those of you heavily interested in on the page criteria...
Over at GoRank they created a tool for comaring the keyword density of various pages. In addition they have a small report about their keyword density findings in the post Florida Google.
While it may not improve your search engine rankings any there are ways to have fun with the search engine results page. If you place escape character codes in your title you can make it show up with arrows or stars on the search engine results page.
for a star use & # 9 7 3 3 with no spaces between the characters.
for an arrow use & # 9 6 5 8 with no spaces between the characters.
In any medium there will be free rides as new adopters take advantage of knowledge not share by their competitors. While there is always a new technology which creates new markets, this quick read does a good job of explaining why off the page optimization is more effective than on the page optimization. Chris Ridings explains "The Glass Ceiling."
Update: above link to chriseo.com/modules.php?op=modload&name=News&file=article&sid=62&mode=thread&order=0&thold=0 delinked, as the site is owned by a domainer and is a page full of ppc ads
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recently Digital Point hacked together a free keyword research tool that uses both Overture and Wordtracker. This tool does a good job of showing the inaccuracies either tool alone may present. Here is their tool if you would like to try it...