One thing I recently tried is by 'testing' my downline to see who is even doing anything at all.  So far I have just done everyone on my first level and will eventually do them all.  I just entered their affiliate URL, you know, website.ws/userid, and entered an email account I had, just as a prospect would.  For those that actually followed up I let them know who I was and gave them some encouragement on the quality of the follow up.  I then also rewarded them by buying a month's worth of advertising on an inexpensive site I use.  Unfortunately out of the 12 I tested, only 2 actually followed up with me.  That at least let me know I have 2 that are serious and 10 that need extra work so I can adjust my communication as necessary.