foozhitao - 3:57 pm on May 15, 2003 (gmt 0)
Some that have worked well for me include ah-ha.com and goclick.com. goclick always seems to have quality clicks and ah-ha.com doesn't send me a lot of traffic but it is definitely making me some money. Most of the other smaller ones haven't yet resulted in any sales so I've canned them. Good luck.