travelentropia.com is a new site that I found recently. It seems to be the end for people having trouble finding an online taxi, or the trouble of finding customers for people who taxi.
There is already a chat channel in entropia for that (#entropia-flight or something like that). Also, someone sent me a PM promoting the website and I was surprised that it opened with "Hey, I think you're and amazing person...) I have a less than 2 months old account, no one really knows me. It just came across as very shady IMHO.
The website can make it easier because some people aren't always online on the game, but if they are online on the website they can get a notification when someone wants to fly with them and just log into the game to taxi that person.