Defcon is an amazing experience that will leave you dead tired at the end of the weekend.
* If you want to meet people, you will.
* The talks are good, but the great ones fill up quickly.
* There are a lot of parties at night, but most card at the door.
* Don't expect to be able to pay cash for your hotel room, the hotel will actually turn you away for this.
* Check the receipt when you check into your hotel, its possible that there could be a mix up and if you don't take care of it quickly enough you could be out of a room.
* In my experience, the wireless network isn't as hostile as everyone makes it out to be. Just (as a precaution) don't do anything sensitive in the clear on this network.
* Don't eat at the Riv! There are plenty of off-the-strip restaurants nearby that are loads cheaper. IIRC, there is a grocery store not too far away either, from which you can get food to make your own meals in your room for even cheaper.
* Do unto others... If you're nice to the goons, they'll be... not... terrible? to you :P Same goes for everyone else. I had a guy ask me once to jump in line ahead of me, b/c he was in a rush. I let him in and got my items paid for and an invite to a party out of it.
I feel like Defcon is growing faster than its infrastructure, which is making things burst at the seams so to speak. I hope they can expand, allowing for more people because Defcon is an experience I never want to give up.