Re: No more flats!... I hope
I used to live in Idaho, and when I'd get back from mountain-biking my tires would be FULL of goatheads, some of them a couple inches long. I couldn't get through a ride without ruining a tube.
I got a liner, and it didn't help.
Then I went to a bike shop and was recommended a teflon-coated liner, and 6 years later I was still using the same tube. It's very, very hard... but most importantly, slick enough to deflect sidewall punctures to the front, and front punctures to the sidewall. This may cause damage to your tire, but your tube should be just fine =)
And of course, don't forget excessive amounts of slime =)