Although there is more free traffic that could be done.

Traffic Exchange: Most People consider this to be to much time consuming. If used correctly, it could save some time

Press Releases: Much like articles but it wont stay up for long.
You could do FREE Press releases at Free Press Release - Online Press Release Distribution Service

Web 2.0: Using social sites like myspace, facebook and youtube is also a gret way to get free traffic.

Safelists: If you plan on getting on safelist I suggest you make a separate gmail account. this is to prevent from getting tons and tons of emails in your inbox that you normally use.

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Yes, traffic exchanges are overlooked most times because not only are they time consuming, but they don't produce many direct results. Even though that's true, they do help in another aspect. The more views you get to your website, especially if you have your own domain, the more crawls from search engines you get. This gets your page higher ranked in the search engines, which gets you more views there.

Another place that is overlooked because of the poor direct response is the classified sites. I've even read in other forums that its a waste of time, because most people just come in, post their ads, and never look at anyone else's. But the ads do the same thing the traffic exchanges do, plus one better. Ads that have been on classy sites for a while tend to be scraped by other classified sites, then posted there; therefore expanding your reach. These are also crawled by the search engines, which gets your site even higher in the ranks. So don't overlook the tedious work that these two avenues have, they can be pretty beneficial to your business.

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You know, Traffic Exchange has an option for $30 a month and you get 2500 visitors each month. This is a very effective method, and worth the money. Saves lots of time.