Beagle - 1:09 am on Jun 28, 2008 (gmt 0) [edited by: Beagle at 1:10 am (utc) on June 28, 2008]
In addition to those thoughts, check the TOS of the affiliate program. Some say quite specifically that an affiliate link has to be identified as one - usually because they don't want any confusion over what the relationship between the two of you actually is. That doesn't necessarily mean it can't look like part of your content; just be clear that you're an affiliate.
[edited by: Beagle at 1:10 am (utc) on June 28, 2008]