TrustNo1 - 10:20 pm on May 31, 2005 (gmt 0)
Depends on how you are setup like what has been mentioned above. If you use redirects then add it. If you use straight network links you don't need it and the "software publishers" are supposed to recognize it and not pop. But they have been known to "glitch" on occasion. As far as the SE's, they know which sites are affiliate sites so using it or not using it shoulnd't have any affect on your rankings.