I've posted a few guides on here in the past such as this one http://forums.digitalpoint.com/showthread.php?t=246124 These have been well received so I wanted to do another. So my question goes out to you all. What do you most struggle with as far as affiliate marketing is concerned? Is it merchant selection, traffic, monetization of current sites, or determining and building sites for specific niches? I would like to take some fairly new people and get them earning their first affiliate commissions.