Increasing Client Satisfaction
While I certainly have reservations about some of what he recommends, there are some great ideas posted on Jim Hassett's blog containing suggestions for improving client service.
I highly recommend checking it out, but let me add my disclaimer. I especially have concerns about #11 (Deepen and broaden contacts at your top clients). Sounds great on the surface, and you're almost sure to get a 4.0 grade from your Sales101 professor. But personally I wouldn't do this unless you are delivering great service already. Or at least good service. If not, you may end up spreading more ill will. It's sort of like when you have a cold. If you sneeze on one person, it's bad, but if you sneeze on a bunch of people you may have a mob riot on your hands.
I have one other concern. Once you go to the client with any of these suggestions, you are on the hook to deliver. Please DON'T ask if you lack the will power or the resources to carry out their suggestions.