About a month ago, a thread popped up at Search Engine Watch Forums named Experience with IntelliTXT? I did not know how to reply or what to say, so I sat back and watched it develop (which is really didn't. Then I noticed that on August 11th, Threadwatch Tests IntelliTXT, which caused bit of a revolt over there. A week later, Threadwatch Drops IntelliTXT due to "Poor CTR, Poor Earnings, User Complaints."
IntelliTXT is a "in-Text advertising" technology, basically, if a word matched an advertisement it would turn green. If you hovered-over the link, it would pop open a small contextually relevant ad (more info).
Nick reported at ThreadWatch that "In 7 days, i've earnt the grand total of $10.92 with a CTR of 1.25%." So he obviously wasn't too happy with those results. I tried to string up some WebmasterWorld threads on intellitext and intellitxt and found some more information. In a thread at WebmasterWorld on March 15, 2005 which reported that it made "ok" money but payment is slow. An older thread on April 22, 2005 reports that "It did not work out for me, as most of my sites are around a niche topic, which does not seem to do well for contextual marketing." But most the threads at WebmasterWorld discuss if you can use both AdSense and IntelliTXT together without violating TOS. Message # 33 in this post seems to be the most recent thread discussing it. I am still not sure if it is OK, I'll try to find out, but it seems like it would be ok to run both on the same page.