A good start
All of the above are just a start. I recommend building a clean image prior to arriving a sodom in the desert. After the conference is over, scrub the drive like the *sic* probably AIDS infected specimen that it is. No matter how good you may think you are, someone has your number. No matter how secure your system, someone has found a flaw you never heard of. Assume that no matter how paranoid you may be, it was not enough. Also beware of blue tooth and such. someone might have a hack for your blackberry or iPhone, so be careful when using those as well.
Try to have a sense of humor about everything, I like to create disposable accounts, just to see what happens. Feel free to log into your disposable account from the open wireless, just to see what they can do to you, consider it an education.