Text-Link-Ads (TLA) is an advertising network that's quite popular among bloggers. I don't know much about TLA, so let's take a look at the introduction by Han Yan Yan:
Quoted content: You just need to insert the code provided by TLA into your webpage, and TLA will display text link advertisements. TLA will promote your site to advertisers and then take 50% of the advertising fees paid by the advertisers as their commission. This means you receive the other 50% of the advertising fee. There’s no need for clicks on the links, no need to sell products, and no worry about not meeting the required number of page impressions. One advantage is that TLA can coexist with Google AdSense; you don’t have to worry about violating Google AdSense rules because they belong to different types of online advertising networks.