HuskyPup - 11:03 am on Sep 23, 2010 (gmt 0)
I've had several of my SEO clients offer me
Do I assume you have not constructed the sites originally?
As a site constructor and SEOer I link every site I've ever built back to my main construction site and none of them have ever been hampered in any SERPs with that link alongside W3C, Copyright, Legal, Privacy, Cookies and CSS all in the footer.
Insofar as I am concerned this has been my standard practice since the mid 90s and I ain't going to change it now.
I suppose the real question is do your clients really want their competitors to know who has SEOed their sites if they are doing extremely well?
Plus, do you actually want/need business from your successful sites' competitors?