Those are great sites! Volunteering can be a daunting task if you don't know how to start! Where will you be volunteering?
I was involved in Big Birothers Big Sisters when in SLC, but since they don't have an office here in Logan, I've been looking into The Boys & Girls Club and/or becoming a Community Coordinator for Education Travel & Culture (ETC). This position would help foreign exchange students become more familiar/comfortable in the community. I know that you and Mike do a lot of volunteering too with MS and The Sharing Place. That is so great. I really admire people who give service.
I can recommend another great idea...volunteering with children/teens with disabilities. The rewards back to you are amazing and the teens get strong role models and a sense of inclusion. It's a win/win situation foe everyone.