Hi Jermaine,
I did a little study in October of last year combining data from Clickbank products in the IM niche and Google listing positions and put together some info. If anyone is interested I can explain how I got it. The list below is from a spreadsheet and it's hard to format in its entirety here, but the list below represents the most common domains showing for an aggregate of top CB products.
If you are trying to dominate the front page of Google, in addition to having your own site or pre-sell or review page showing, it would be wise to post material on these domains optimized for your keyword terms. I can't say that I dominate Google for every product I promote, but I have held 4 out of the top ten positions for a number of top product launches using these feeder sites to my main money pages.
ARTICLEBASE (15)
HUBPAGES (14)
EZINEARTICLES (13)
DOCSTOP (13)
JUMPTAGS (12)
MIXX (11)
SLIDESHARE (10)
GOARTICLES (9)
DIGG (9)
SQUIDOO (8)
CLIPMARKS (8)
ZIMBIO (7)
ARTICLEALLEY (6)
GATHER (5)
A1ARTICLES (5)
FEEDAGG (5)
USFREEADS (4)
FOLKD (4)
FREE-PRESS-RELASE (3)
KEWEGO (2)
XOMBA (2)
QUIZILLA (2)
BLOGGER (1)
PRWEB (1)
KABOODLE (1)
ARTICLEDASHBOARD (1)
WORDPRS.com (0)
If you would like more info on how I got this list or what the number mean--just ask. But these are all good domains to use for back-links and to get listed themselves high in Google.
Additionally, remember--Google can not only read text and HTML, she can read .pdf, .doc. and .ppt files as well. You can create PDF files for example, host them up and back-link the heck out of them and they can show in Google as well. Just another way to take up valuable Google real estate and keep competitors off the front page.
Hope that helps--Mike