In our school, the kindy room moms are really important because the teachers need/use so much parental support. Our room mom in Kindergarten was awesome -- just totally on top of things. She was in charge of recruiting and organizing parent volunteers for center time, holiday workshop, PE testing and field trips.
One thing she did that I thought was great was that, for Christmas and end of year gifts, she sent home an envelope with each kid, with the room mom's name on it and a note about the suggested contribution. All the parents had to do was put whatever amount they wanted to contribute in that envelope and return it to school. It was so easy.
DC1 -- 2005 DD -- 2009 DS -- 2011