Online support is available via the unRAID Community Forum. Our comprehensive forum is very friendly with many regular posters eager to help out, including several long-time users of unRAID OS.
In addition to the forum, there is an unRAID Community Wiki. Mainly community supported and maintained, the wiki is a vital repository of unRAID OS information and documentation. Some key pages include:
Blogger Howard Marks has written a nice article for Network Computing entitled unRAID But Not Unprotected.
Andy Fair of bit-tech.net describes How to Build a DVD Server.
Revision3: unRAID: The Free NAS That Recovers Data If A Drive Fails!
Original monster thread at AVSForum.