Something i am sure most flight sim enthusiasts have thought about doing is flying around the world virtually.
I have made an attempt about 3 years ago but my pc died and life stuff got in the way. A great approach to this challenge is from these guys over at Around The World Club. A great website and the whole thing looks well organised. To read about other people doing it and seeing there progress is a great motivator. I am eagerly awaiting an email to see if i can be let in.