clipped from: www.vandelaydesign.com 
Text Link Ads (aff.) - The leader in paid text link ads.
LinkWorth - Keep up to 70% of the ad revenue.
Text Link Brokers - Make money buy selling links in a directory on your site.
Live Customer – Static HTML ads with flat monthly rates.
LinkAdage - Matches advertisers with publishers
Direct-Link-Ads – Keep up to 75% of the ad revenue.
PaidTextLinks - A smaller text link program.
Kontera – Create contextual links automatically.
AdSter - Customize your ads to match your website.
Vibrant Media - Vibrant in-text advertising.
TextAd.biz - Basic text ad service.
SearchFriendlyAds - Not live yet.
YzMedia - Another text link option.