1Google Currents (Free)
2Gmail (Free)
3Google Search (Free)
4Google Translate (Free)
5Vtok (Free)
6TouchDocs ($3.99)
7Quicklytics ($1.99)
8Google Play Books (Free)
9Google Catalogs (Free)
10Google Earth (Free)
One more for downtime. You may be temporarily grounded, but this app lets you hold the world in the palm of your hand. Happy travels.