I actually got turned on to distance riding from reading a book!
After I got out of college (& paid off the car & the school loans) I
finally had enough money to buy my first horse.  At the time I really
didn't know what I wanted to do - I was never into showing & didn't have
any desire to be, but I'm a little too goal-oriented for just hacking
around.  I had done a lot of trail riding, & thought I would get a
Tennesee Walker (rode them alot when I lived in North Carolina - nice
breed).  Then, I saw a book in one of the horse mail-order catalogs I got
- it was Karen Paolo's "America's Long DIstance Challenge".  
I ordered the book, and after I read it, said "This is it! This is what I
want to do!  (I had never even HEARD of the sport until then.)  So I
called one of the phone numbers for one of the organizations listed at
the back of the book - I believe I ended up talking to Jane Soule of
ECTRA up in Connecticut.  We talked about the sport, & what kind of
horses compete, & who there was in my area who did this.  And that was
the start...I ended up buying an Arabian & six years later I'm still
hooked!
Kathy & "Shane"
Camp Hill,  PA