Check out the free MB tutorials at 3D Buzz. You may have to dig down the interface to find them as they are not listed on the front page but the tutorials are very informative and worth seeking out, especially for specific tasks that are typically are 'glossed over' in the official manual. I found their lessons on the various constraints available in MB to be most helpful. The url is
http://www.3dbuzz.com.
For paid info, the few MB training courses at
http://www.digitalttutors.com are helpful too. These lessons are more generalized but if you know nothing about MB, they are good crash courses in the basics of the program. You can subscribe for just a month and get all the basic info about MB you need. (If MB lessons are all you need, don't forget to cancel before the end of the month or they will automatically renew your subscription. You can always renew later if you want.)
Autodesk also has some good tutorial at the Area website (including some, but not all, of the 3D Buzz stuff.) The link is area.autodesk.com.
Hope this helps.
G.