Someone asked about ground transport from the airport to the hotel, and sharing rides. A taxi will cost about $40 one-way. There's also the Super Shuttle airport limo (minibus) service, which is cheaper than taking a taxi but reservations may be needed. Public transport is also available, but according to reports it isn't quick. See http://us.pycon.org/Addison/GroundTransit for details on all options.
I started a wiki page for people to arrange taxi splitting: http://us.pycon.org/Addison/TaxiSplitting. Sharing taxi rides may be difficult though, because arrival times are staggered and flights get delayed.
I recommend that anyone interested in sharing a taxis should wear a Python or PyCon T-shirt or sweatshirt when travelling so people can recognize each other. Here's a source of official Python garb: http://www.cafepress.com/pydotorg.
If anyone has other/better ideas, please add a comment.