6. IAmHere
Want your friends to know exactly where you are? (Scorpion Bay, Baja!) IAmHere sends an email with a link to Google Maps. In my tests it was accurate to within a hundred feet. $0.99

7. World Customs
Which way to wrap that kimono? World Customs dispenses international dos and don’ts, one for every day. (Kimono? Left over right.) $0.99

8. Wi-Fi Finder
International data rates can be crushing, so finding Wi-Fi is key, especially if you Skype. Wi-Fi Finder tracks over 200,000 hotspots in 135 countries. The only quibble: It could do better at distinguishing free from paid spots. Free

9. The Weather Channel
Weather Bug and AccuWeather come close in the race for full-featured meteorological apps, but the Weather Channel’s gets the nod for customization and the ability to check out conditions in multiple locations at a glance. Free

10. Google Earth
Although slow even on Wi-Fi, browsing satellite images of anywhere from your vacation destination to the top of the Matterhorn is still one of the best ways to get the lay of the land. Free