A great source for tutorials and faqs, as well as managed service providers industry news and events.
Managed Services Provider University provides IT managed services education, training, fulfillment, and consulting services to managed services providers worldwide.
IT Services Wiki
IT Services Defined on wikipedia. Includes a comprehensive list of additional IT educational links.
Wiki on IT Managed Servies, their importance and what benefits they offer your systems
Bulletproof IT Blog
Popular blog that covers a range of current topics concerning IT and Managed IT Services