Sign up for a free TripIt membership to build your travel itinerary. Then get the free app for your mobile device (iPhone or iPad, Android, and BlackBerry) to keep track of your plans on the go. TripIt’s strength lies in its social connections. Share your travel plans with your colleagues and friends; you can also track their travels on a map. For about $50 per year, sign up for TripIt Pro, which sends alerts about flight delays and cancellations and offers a year of free Hertz Gold membership and access to business lounges in airports. Keep track of your airline points here, too.