Reimbursement while at job search

they'll pay for your hotel
20% chance they'll buy your airplane tickets (but you'll say what flights you want)
they'll cover all your miscellaneous costs (airport parking, etc.)
you can even bill them $0.325/mile for driving to the airport and for that $5 sandwich you ate in the airport
you'll start wanting to do multiple interviews on the same trip. Feel free to try to negotiate time slots which are convenient for you, even if it means spending an awful lot more money on airfare. If you've got two things in the same city, feel free to invent some kind of cost-sharing between different institutions. I would photocopy my receipts and make a cheesy spreadsheet showing who owed me what. Never had a problem.
(pleasant) surprise was that some hotels these days have Ethernet in them. You plug in your machine with DHCP turned on and everything magically works.