In addition to my experiments with AdBrite and YPN, I have been running a trial of Text Link Ads. Text Link Ads is different than Adsense. Instead of showing ads based on the content of your site, Text Link Ads brokers text ads on your site for a flat monthly rate. They serve the ads on your site without redirects, so the advertiers can receive some search engine optimization (SEO) benefit from the pagerank of the your site.
After completing a brief application, my site was auto-approved by Text Link Ads. There are a few different ways to integrate the ad code onto your site. I chose to use the PHP method which required me to install an xml file on my server and include an xml parsing function in my code. Although posting the ads in more complicated than putting up Adsense, it only took me a few minutes to get everything up and running. The extra complexity is so that the ads can be shown without using redirects.

Once I had the ad code integrated into my site, I had to wait for an advertiser to purchase one of the four text link ads that I put up for sale. While waiting for an advertiser to show up, Text Link Ads shows a blank ad. It would have been nice for them to at least offer to place run of network CPC or CPA ads to help me monetize the traffic in the short term. Adbrite offers CPC run of network ads while you are waiting for an advertiser to pick up your inventory.

Three days later, I received an email from Text Link Ads letting me know that someone bought an ad on my site. After approving the ad, it started showing up on my site and I was making some money. Overall, I have been very happy with the Text Link Ads and it has been very easy to use. I have read many positive reviews of the service around the web, and it could be well worth trying out on your site.
I recently purchased some ads from Text Link Ads as an advertiers, and I will be posting the results in the future. I also think it is important to mention that they have a solid affiliate program. The program pays $25 for every publisher or advertiser that you refer. I will be doing some testing of the affiiliate program as well and posting my results here.