Resources
Didn't find everything you were looking for? GREAT!! That means you're already pushing the boundaries of what you want to learn. Careful: we might make a rigger of you yet.
Books
Demo Files
How to Cheat in Maya by Kevin Roy
Although 2014 is the year I'm familiar with, any of the How to Cheat in Maya books are a good investment. While not rigging specific, they contain a lot of great information concerning Maya and her never ending complexities.
Online Courses
Links
Rigs (good ones)
Sectional Rigs (Good for animation studies)
Full Model Rigs (Good for pantomime and lip sync)
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Bonnie (an oldie but a goodie)
Other
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Ashwin's Super Hero Rigs (because supers!)
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Cody (quadruped)
Coming soon
Lynda.com
Common among academics, Lynda.com has a huge array of courses, and not just for Maya but most 3D programs. A subscription is required, but worth it if you're interesting in learning more about any craft. If you're a student or professional, check to see if your school or employer can get you a discount.
Digital Tutors
Common among artists and professionals, Digital Tutors offers a variety of industry professionals teaching courses from every aspect of the pipeline. Some of their courses are free, and cover everything from beginner to advance.
Rig it Right by Tina O'Hailey
If you're interested in continuing on to rig a character, I can not recommend this book more. Tina has a sense of humor and a ridiculous understanding not only of rigging, but of animators dreading it. It's a dream book if you're a bit wary to go down the rigging road, and you will be a master by its end.
Animator Friendly Rigging by Jason Schliefer
This four part series comes in PDF format, and was designed by a rigger who understood how difficult rigging can be to grasp. He breaks down concepts with plenty of animation-friendly sketches and references. Great instruction for beginning riggers and animators alike.
1.01 Maya Interface
2.06 Null Groups
2.07 Constraints
Dummy_Demo_constraints.mb
3.06 Skinning