Darren over at ProBlogger shares in-depth info and resources regarding the 8 most popular methods of monetizing your blog. Affiliate programs, of course are mentioned as one of the ways. Then in another long informative post he share answers to the age old question "If my blog has X number of page how much should it be earning?". In this post he actually shares real numbers about 3 of his blog including number of views, monthly earnings and from what types of revenue sources.
Making Money from Your Blog - 8 Direct Methods: ProBlogger Blog Tips
Also see
How Much Money Can a Blog Earn?: ProBlogger Blog Tips to get answers to the question: “If my blog has ((insert daily number of impressions or page views of your blog here)) how much should it be earning?”"