BaseballGuy - 5:41 pm on Feb 21, 2012 (gmt 0)
I own an SEO company and give out a flat 20% (recurring monthly commission) referral fee to anyone who refers me new clients for both SEO and online reputation management.
I expect the same from the coding companies that I use when I send them my clients to get website coding work done.
20% recurring monthly is a fair number. 20% is also a fair number if it's a one-time project.