Here's an interesting, novel, free, and easy way to help American service men and women.
Yesterday, I finally checked out WIL WHEATON DOT NET (yeah, that Wil Wheaton - funny guy, good blogger) and one of featured links was to Gmail4Troops.com.
The concept? Gmail is free and can handle gigantic files, meaning troops can get photos, movies, and other datagobbling messages from home without mail bouncing back home.
I've had a gmail account for awhile now, but I don't really use it. Hadn't even noticed the "invite" feature until the Wheaton/Gmail4Troops sites prompted me to figure it all out.
Hope it helps. If you have gmail invites, consider doing the same.