I'm trying to look at this using an iPad 2 running 8.02. I'm finding the copy behavior to be rather balky in both Safari and Chrome. It's difficult to select precise text. I didn't find that "clicking" in the reply box first helped.
I'll be working on a more mobile-friendly version next year. If there's anything else you guys have noticed that I need to focus on please let me know, particularly features you may have observed at other sites.