OregonLive.com has a business directory and you can add a business listing in there for free. Click here to get started.
Here’s another place where you can post a business listing. One of the best parts of this site is that it allows you to tag your business listing with related keywords. This should be of great help to the search engines.
I’ve found another place to post your business listing for free. PDXstump is a very unique little directory. The format they use, while a little hard to navigate, is very search engine friendly. I would highly recommend posting your business listing there.