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I'm afraid my IK tutorials are basic as well since that's the target audience. However, I've used IK for facial animations in conjunction with morph targets for more advanced stuff. You can also constrian the motion to planes complete with specific range of motion limiters.
Honestly, it's not that hard to apply information from any other program into Carrara. Most of my advanced IK knowledge from slumming though CG Society and various Maya sites and then dabbling a little with Carrara's tool set until I could reproduce the results.
If you're interested in imitating stop-motion movement or don't actually want organic IK interactions, then using the motion constraints and building a Parent/Child structure on your figure is really fast and easy to implement and control. Any concerns about abrupt mechanical movement can be massaged with the tweener functions.
Mark
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