My friend Josh has told me that there is no such thing as too much mail, Don, and he's in the eighth week of training.
At first it was hard and I thought, man, how am I gonna keep up mail enough (I send out six to eight letters a week) through the next 10 weeks -- I got the first letter from him two weeks in because obviously he sent the form letter to his mom.
But I have found tons of stuff out there, questionnaires, jokes, inspirational quotes, motivational stories. I send him articles, news about college football (he's an Alabama fan and sports fan in general), and just tell him about what I'm up to. I've gotten into a rhythm where I write three days a week which generates two letters each time usually. In the last letter Josh sent he said the volume of mail was appreciated.
There's a great thread in The Slop Chute section here on this board called Chuckles of the Day. I've been going through and copying and pasting (thedrifter finds some great jokes out there, thanks Ellie!) those jokes into a document file then printing them up.
There's a couple other sites you might want to visit:
www.recruitparents.com and parrisisland.yuku.com
:)