Johnny Jet heard the previous call about tracking your kids. He says that there's the Trakdot, which you use to track your luggage, but there's also a new device called the Tile, which is supposed to affix to anything and can be tracked with an app. It uses Wi-Fi. It's not available yet, though. The chatroom says it has a battery that isn't replaceable and you have to send it back to get it replaced.
Johnny says that shipping your baggage via ground is a great idea, except for when traveling internationally. If you're traveling in the states, you can ship your luggage ground and it'll be waiting for you when you arrive.
A great app and website - Hotel Tonight. It enables you to get a last minute hotel room for a great rate. Hotels give them last-minute deals on their unsold rooms, with discounts up to 70% and you then book the deals from your smartphone.