That wouldn't be a good idea. The downside would probably be a banning by Google.

Steve, you're wrong man. Google is not going to ban you.

There is absolutely nothing wrong in creating loads of blogs, ie, one at blogspot, live journal, wordpress, etc, etc and so on, create an article on each with desired keywords and write an article once a week on each of them, then head over to social bookmarking sites and book mark each of those free blog post articles.

Then create loads of squidoo pages and link them to your social bookmarking urls that you previously did, create more articles for your blogs and link your blog articles to your squidoo pages only, leave out your main website link, reason being if any of the free blog accounts notice a huge influx of the same links in X amount of posts they will disable your account, not all do this mind you, but most do, especially blogspot and wordpress.

Then head over to hubpages and create loads of those, link up your blogs, social bookmarking sites, squidoo pages, and your own website to those articles you create on hub pages...

then head over to craigs list and make one post for each of the links you did above.

then head over to yahoo answers, create about 5 usernames, each asking a question, then next week, go back and create 10 more usernames, or as many as you like, and answer each of them and present a link to each of the sources you just made earlier.

then head over to yahoogroups and join loads of them, like 1000 or so, submit your links above, and within about 2-4 hours, you'll have about 100 back links, and over time, you'll have about 3000 backlinks pointing to each of those links above, how? people use rss feeds for their blogspot and other sites that come off yahoogroups.

then create a video, or lots of them and submit them out to loads of video sites.

Job done.
repeat and spin.

of course, you could use article directories too. and forums. and guest books, and free classified ads, press releases, the list goes on.