Hi Mud,
From my experience with the Classic Flight here in the UK,
www.classicflight.com, I can truly say you won't regret it. Now in my third year as a volunteer, I have met lots of interesting people,some famous, worked on some really cool and unique aircraft, had quite a few flights, seen the BBMF's Lancaster all the way through its major overhaul from arrival to first flight, sat in a Spitfire

,Painted parts, made some parts and generally had a blast.
Oh and swept the floor, put up fences and been a guide on open days.
The only piece of advice I would give is listen to what folks tell you to do, keep your wits about you at all times, aeroplanes can bite ! And try to volunteer somewhere reasonably close to where you live so that you will have more time to spend there rather than travelling.
Good luck, Alan
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Those that can do,those that can't be bothered,TALK about it.
Volunteer with Classic Flight and a member of Beech Restorations team.
http://beechrestorations.wordpress.com/about-us/http://www.classicflight.com.