iGetcha.org is a suggested opensource and free software directory for the technological sustainability of nonprofits. It's also a simple, non-techie shortlist to assist organizations with a SOHO.
I haven't tried it yet but if you set up something similar to this http://www.intomobile.com/2007/05/09/get-free-incoming-calls-on-t-mobile..., you can use what is now Google Voice instead of Grand Central to get free incoming mobile calls to avoid getting charged.