Hi Maine Maid,
I've heard very good things about the Trek Across Maine and I'll be riding it for the first time in 2007. All of my friends who have ridden it tell me that it is a blast (depending on the weather of course) and a very supportive environment. Until this last summer I did mostly solo cycling. But a friend convinced me to ride the MS 150 (out of Standish) in August and loved it so much I did a bunch more charity and group rides.
The TAM site has a training guide that you might want to take a look at. Building foundation miles as you are doing right now is a good approach. As the time gets closer you'll probably want to supplement the steady effort workouts with some drill work (fast cadence and power intervals) to get ready for the hills.
But don't focus on the hills! With a good fitness base, good form, the right gearing, and a good outlook on the ride you'll be fine.
Good luck and perhaps we'll see you at the event this year!
traveller
Happy New Year Everyone!
"It never gets easier, you just go faster." -- Greg LeMond