My alternate-history message-board allows for alternate histories of fictional universes (known as "AU" in the fan-fic realm's parlance) in the "Alien Space Bats" section. Although that part of the site is restricted to members only, I've encouraged many writers of interesting scenarios to post them on fanfiction.net (or other such sites like AO3) so I can share them with everybody.
So without further introduction, allow me to introduce "The Skywalker Heresy," a Star Wars AU story beginning soon after the Battle of Coruscant. Palpatine has already set in motion the final chain of events to make Anakin Skywalker his new Sith Apprentice, but even the best laid plans of mice and men can be set awry by the smallest things.
(Seriously, Anakin's canonical fall was a pretty tenuous, unlikely thing, although I've heard the animated Clone Wars series does a really good job setting up Anakin for this particular path to damnation. It'd be pretty easy for things to get...complicated.)
The author has posted the entirety of the first full story set in this alternate timeline on the message-board, but will be posting it on fanfiction.net a chapter per day due to the need to scrub some coding. I won't go into a lot of detail about what happens in it to avoid spoiling some fun surprises, but some knowledge Clone Wars series would be helpful.
And he's promised there will be more stories. So keep those reviews coming!
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