I agree with Alistair that the font in the print edition is Adobe Text Pro. Interestingly enough, the online edition uses Gentium Plus. Not sure about that call, probably made by some developer… (you can't trust those guys).
That being said, my personal preference is for Baskerville for any Latin alphabet text (so, so tasty) and our Accordance fonts for others. I'm not a fan of hard angles on combining marks, so that's kind of a deal breaker for me. In addition, though I understand the portability of unicode, I fall back on the ascii fonts all the time because of the granularity I have in properly aligning the marks. I've yet to find a system, outside of LaTeX which in almost any case gets it right without me adjusting things.
Anyway, this was a fun project, I'm glad you all appreciate it so much.