Took me a while to figure out that using the options menu in emacs and setting the default font won't save the font. Then after customizing my init.el, I could see my font change happen only to be rolled back when the zoning stopped.
More searching brought me to this: #94
I finally added (live-set-default-font "Menlo-18") to my /Users/danm/.live-packs/danm-pack/init.el and found relief.
Can you put this information in an obvious place on the main site or in an FAQ? I imagine many people change the default font and are frustrated when they have to do it every time they reopen emacs.
Other than that, great job. I really appreciate what you have done with emacs-live.