Don’t forget about SignUpGenius, a great sign-up option for anything for which you have to recruit a set number of volunteers at certain times. We have two or three events in the coming months for which we hope to use SignUpGenius again. See this sample, from a 3-day prayer vigil related to unreached peoples:

http://www.signupgenius.com/go/30E0E49A4A62AAB9-light