First inpression from the AoIR 2004 conference: no wireless! In fact, for such a large conference, there is only one computer lab with internet access. Not for laptops, but for using the stationary computers.
It's fun to watch all the frustrated bloggers, repeatedly throwing their hands in the air, exclaiming
"WHERE IS THE WIRELESS?!"
(It's a situation where Tinderbox is an excellent blog environment. I can blog offline, and just upload whenever I get access.)