Frankly at the moment, we're not using any external clojurescript libraries; we've tried many, but none quite meet our needs or the style we really like. We're internally phasing out jQuery selectors in favor of some code that we'll be releasing once we know it's battle-hardened and ready.
We don't use an MVC or components type framework, but ideas about how to setup those abstractions are percolating.
Ah sorry, I didn't see. So the decision about DOM elem vs String is one I'm not 100% sure about, but I think the performance difference is at most like a 10-15% difference which wasn't that compelling to us. So I didn't see a strong reason to go one way or the other and the code I believe is cleaner producing nodes rather than Strings, but I easily could be wrong on both counts.
I didn't actually consider EDN. I haven't see enough of a win over JSON to consider it, but that could just be misinformed.
We don't use an MVC or components type framework, but ideas about how to setup those abstractions are percolating.