More than that. If you offer SEO services then reading this might be invaluable.
It's how to get clients, give them good value, manage your workload, and then scale up effectively.
http://www.demondemon.com/client-based-marketing-offline-seo/
Many try hard with this and fail for the daftest of reasons.
Under-pricing themselves, working too hard, being afraid to outsource, not knowing what tasks are vital,.
Even how to report to clients effectively (vital if you want them to stay long term)
Managing expectations. Some clients expect month after month of the revenue and traffic chart going North - some have more reasonable expectations.
Anyway - worth checking out.
Scritty