This year I intend to make audio recordings of the presentations I attend. I assume there shouldn't be any problem doing so.

I attended Ohio LinuxFest two years ago as well, and I recorded a few of the presentations, including the KDE 4 presentation. Would anyone be interested in these? I think I still have them? Quality wasn't outstanding (i.e., I used a microphone plugged-in to my laptop), but everything is clear.