Mirapoint and xchange magazine have an e-book titled Transitioning from Consumer ISP to Business ISP.
Verio has an e-book titled A Telco Survival Guide for the Web 2.0 World. Page 3 has a case study about a WISP, who followed one of the 50 Ideas - he called his customers resulting in extra revenue. (BTW, Verio is one of the few Internet backbones to be IPv6).
Want a copy? Drop me an email.