Secret Classes from WOTC

[Aetis]

I just found out that Wizards of the Coast have released some classes on the side without including them in any books, such as the Swiftblade, or the Arcane Duelist.

Are there more?

Where can I find them? Google is proving to be quite unhelpful in this regard.

[OldTrees1]

http://www.minmaxboards.com/index.php?topic=513.0

This includes a lot of previously printed material but it has links to all of the "secret" classes that are online