The two biggest helpers are networking and past-endorsements, both of which can be helped by sites like LinkedIn.

Your quote about saving 10 hours a day - try and get that as a formalised written recomendation, and do so for all future clients as well.

Also encourage your current company (assuming they aren't pissed at your decision to leave) as well as future clients to recomend you to business partners that they think you might be of use to you - the majority of the consultancy work I've done (albeit in Marketing rather than IT) has been through word-of-mouth recommendations.