I've signed up; it reads as doable, which some of the AI stuff reportedly hasn't been, I get the impression.
Not sure about your reports; as one data point I'm taking both AI and ML courses while working full time; they're quite doable (and I'm a rather average lw forum member as far as math is concerned). I have the impression at least the ML course has been slightly dumbed down for this wide an audience.
[The Stanford-class.org scheme seems to be adding new courses every few days. Instead of a new post each time a new class is added, I commit to keeping this post stocked with links to all current course offerings until at least January 2012.]
Complex Systems
Model Thinking
Electrical Engineering
Information Theory
Civil Engineering
Making Green Buildings
Medicine
Anatomy
[Cancelled]
EntrepreneurshipThe Lean LaunchpadTechnology EntrepreneurshipComputer Science
Computer Science 101
Software as a Service
Human-Computer Interfaces
Natural Language Processing
Game Theory
Probabilistic Graphical Models
Machine Learning
Cryptography
Design and Analysis of Algorithms
Computer Security
[Ran Sept-Dec] Machine Learning
[Ran Sept-Dec] Introduction to Artificial Intelligence
[Ran Sept-Dec] Introduction to Databases