Audible.com subscription
Listening to Audiobooks is a great way to make productive use of the ride drive (or commute, or eternal family roadtrip).... I've found the Audible service to be a great way to get current issue books, in a convenient form that now works on most phones, iPods, mp3 etc.
Singletrack Pub is an Audible affilliate (which means we get a tiny credit if you start your purchase or subscription via the links below. I've had the Gold Membership below ($14.95/month) for 3 years and while sometimes I think it's too much content - somehow I always catch up.
The Gold subscription deal gives you 1 credit per month - with most books being 1 credit regardless of whether they'e 4 hours of listening - or 26 hours. Some are more credits - and that's what's nice about the occassional build-up of credits.