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This post is to compile all the existing Quest Worlds in one handy place.
I'm sure I missed a few. If there are any more, please let me know, and I'll amend this post.

Legacy & Ice Age, by Xyx http://www.slightlymagic.net/forum/download/file.php?id=17282
Mirrodin, by Serrasmurf http://www.slightlymagic.net/forum/download/file.php?id=20839
Kamigawa, by Chrono-Jack http://www.slightlymagic.net/forum/download/file.php?id=9588
Ravnika, by Serrasmurf http://www.slightlymagic.net/forum/download/file.php?id=9588
Lorwyn/Shadowmoor, by Erazmus http://www.slightlymagic.net/forum/download/file.php?id=14176
Zendikar, by Serrasmurf http://www.slightlymagic.net/forum/download/file.php?id=16610
Innistrad, by Fizanko http://www.slightlymagic.net/forum/download/file.php?id=20634
Theros, by Xyx http://www.slightlymagic.net/forum/download/file.php?id=17622


Scars & Innistrad, by skobvs http://www.slightlymagic.net/forum/download/file.php?id=23608

There are a few user made Quest Worlds.
One is Innistrad, made by Fizanko IIRC. He provides the links in his signature.
I also have a Theros World (from Xyx) and a Kamigawa one (don't remember the author).

Try digging something from this thread:
viewtopic.php?f=48&t=9457&start=150
Some of them became "official", others you'll have to add manually.

See OP