Travel insurance. The single one to cover the personal belongings (iPods, laptops, photocameras) that we found is World Nomads. Haven't used it yet, but according to extensive research on internet, they are good.
Registration of internet domains. Great idea came to your mind while travelling, and you want to claim a domain before anybody else does?
Online betting. If your favourite team is playing, and you want to make a bet while on a trip, use //** Removed for the time being **//. Tested and reliable.