What surprised me when I attended Ohio Linux Fest was that it is a national conference; it draws people from all over.
One of the little-known gems at OLF is their training sessions called "OLF University." It is excellent training that is at a very nice price. Considering the high-caliber trainers that they've recruited, I think (and I've told OLFU coordinators) that training like this should be priced 2x or 3x higher. The productivity boost from just one class will pay for itself in a month or two. I recommend people sign up before the organizers start listening to me.
If you aren't going to OLF University, but are going to OLF, be sure to stop by the LOPSA table!