what type of scales, techniques, theory are used in folk/indie type music?
such as Iron and Wine
Yea, pretty much good stuff. suspensions are great
"Things seem pretty crummy, but if they could carry us away with them, we'd die of poetry. In a way, that wouldn't be bad." -Louis-Ferdinand Celine
Quote by brenton393

It's an extremely broad genre that you're talking about here. But all songs of all genres will end up with major and minor scales, all the things that Sean has mentioned above. In any case why would you want to limit yourself?
And no, Guitar Hero will not help. Even on expert. Really.
Major scales and Minor scales. Could use modes...
As long as it sounds folk is good.
Generally folk only uses simple traids. Rarely get major7 or minor7. Ocassionally a dom7 might pop up but generally stick to simple chords.