OK, I'll bite. It's only $25/month, and I got a good vibe from reading swombat's notes from the one course. I just signed up, and am looking forward to gaining some useful knowledge here.

We (Fogbeam Labs[1]) are still in the "Customer Discovery" phase of Customer Development, and I'm hoping some of the material on Mixergy will: help with finding people who will participate in the CD process with us, and help us nail product/market fit.

[1]: http://www.fogbeam.com