Ecomomics go-to conversation resources

I posted this over at Atheism+, where I am intending to become an active member. Y'know, in all my free time. Maybe I'll post something soon about why I think that atheism+ is a great and positive thing that I hope grows and becomes a force to be reckoned with, but not today.

Anyway, here's a question I asked there, which might as well get cross-posted here:

No, I'm not looking for homework help ;)

I found myself in an unusual position yesterday while having a Facebook discussion with some politically conservative friends from high school; I tossed off what was meant to be a transitional comment that supply-side economics is completely empirically discredited, which was met with complete disagreement. Now, if this were a discussion of evolution/creationism, or of abortion, or many other topics that I find myself sparring with friends about, I have a go-to list of links to introduce people to the ideas, going from the friendly and accessible to the mathematically and statistically imposing.

But what I realized about economics (in which topic I am very much a layperson) is that the conversational/blog circles I move in treat supply-side economics as very much a settled deal, and if they pass on evidence (such as is done here) it's in the spirit of "let's add one mote to this mountain of empirical disproof of this theory". I don't know of a resource intended to gently (or not-so-gently) bring someone into that conversation.

Do y'all?

======
Update: A couple of good links to Jared Bernstein out of that discussion already: a qualitative intro to several of the theoretical problems with supply-side, with an internal link to empirical work by Saez and Piketty on the correlations, if any, between high-income taxation and economic activity/growth.