Everyone can get burned out. Read this great article from Points of Light on how to keep your volunteers engaged and coming back for more.
http://contentz.mkt4753.com/lp/40948/394938/How_to_Manage_Volunteer_Burnout.pdf
More ways to prevent burn out is to consider a online volunteer management software. ivolunteer.com can assist Volunteer Managers with methods of collecting volunteer information, communication to volunteers, event and project online signup, and reports. We even have consultants to help you get started to make the best use of your online volunteer management setup.