This topic came up a few times during sessions at summer leadership. The consensus seemed to be:
-- Personally ask members to get involved. When members are approached one-on-one, the chances of them getting involved in association leadership roles, committees, activities, events, workshops, etc. improves dramatically.
-- Don't forget to use word of mouth when marketing your activities to your members.
-- Consider how you can make such requests relevant. Members are more likely to get involved if they feel they will make a difference and/or see the benefits of their involvement.
-- Target your requests to members whose skills, qualities, personality, etc. apply. Ask the right member to do the job that is right for them!
Additional information regarding member involvement can be found here under idea #110: "One on one meetings":http://www.njea.org/phpbb/viewtopic.php?f=10&t=33&start=110
If you have other ideas or techniques that have worked for you, please post them!