The fine people over at SEOmoz have ran a survey at the end of December 2011 asking SEO consultants how they charge their clients and the services provided. Well the results are in and their is a great infographic from ATYM that breaks down all the data in a very digestible format. It's below so have a look.
The SEOmoz blog post also contains the top 9 key takeaways from the survey, pretty handy when comparing cost and types of services.
Here's the graphic...enjoy
This graphic was done by AYTM. Go check them out.