I could guess Notch dosn't have time for it, but I'd be happy to make a site that lets you upload maps and displays them for download. Infact I am working on a map to image thing right now. So you could upload you map give a discription and the website would generate a picture for it. It'd be kinda minecraftskins.net but with maps....
For example, I just google searched minecraft maps. The first thing that came up was a minecraft map website.
Minecraft World Share
Retired Moderator on Craftyn Towny
If not you really need a better explanation.
I kinda like fallout
Off topic; if you put a download link in your signature, it's a real **** move.