We've been trying txtouch with our church community.
From what we've seen so far it really is superb, and has given us a whole other avenue for connecting with people in a different medium to email/web.
They offer discounts to charities and church groups. It's run by an old friend, from previous church connections, who I haven't seen for many years.
Some info from their site:
"What is txttouch ? txttouch builds a mobile phone contact base for your company and then enables you to contact that list (regardless of its size) in an immediate and cost effective way."