Airport parking. To save money at airport parking lots, visit the aptly named AirportDiscountParking.com, which will direct you to bargain lots and offers printable coupons for additional savings.

Currency conversion. Check rates at XE.com. Along with an easy-to-read conversion rates grid on the homepage, this site offers a host of tools including a travel expenses calculator, credit card charges calculator and, obviously, a conversion calculator.

Flight information. AvoidDelays.com, the National Air Traffic Controllers Association (NATCA) provides online updates for flight delays; you sign up for e-mail and phone alerts, too. If you haven't booked a flight yet, you can search for the best time of day to schedule a flight from a specific airport and find out which airports to avoid for connecting flights.

Global Points Exchange program at Points.com to trade points and miles between rewards programs.

Packing. Pack lightly to dodge baggage fees. OneBag.com offers packing tips, including updates on banned carry-on items.

Seating. At some airlines, better seats come at a price. SeatGuru.com indicates which seats cost a fee, as well as which have the most (or least) legroom and recline.

Trip insurance. Purchase Trip Insurance at deeply discounted rates