Nice list. Along the lines of post yesterday, I'd encourage the developer to use an IDE and gems as little as possible in order to truly get what's going on under the covers. Also, the moving on is an excellent point. I've recently started an app-a-month goal for myself (I'm married with 2 kids) in order to keep myself shipping. I don't know how many times I've rewritten my mp3 site since 2002 :)

Here's one more comment.

11. Add Unit tests to anything you've developed that you want to keep developing.