Now FS2004 users can stop feeling jealous of FSX folk who can fly into space -- you can go one step better, with Terrabuilder: Moon.
This has been in development for a while, I'd forgotten about it, until it was released this week. This addon basically reworks the entire Earth, so that it becomes the moon. It also includes a few moon bases, and some vehicles for getting about. Oh, and autogen moon rocks...
This is very expensive, at US$60, and as I've retired my credit card for the foreseeable future, I won't be getting it any time soon. However if my circumstances change (like everyone buys 'Real NZ' for Xmas) then I'd certainly love to have this to play with.
Terrabuilder has been around for a long time, their main product has always been Terrabuilder Pro and Lite, which is used to create photoreal scenery for fS2002/2004.
Visit Terrabuilder for details.