Here are a few ideas from my side:
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Revisted talk "X More Ineffective Coding Habits of Many Programmers". In one of your interviews, you mentioned that you do a lot of code reviews. I'm sure you've noticed recurring code smells. I am also sure our audience is not immune from them. If you could compile a list of "the worst habits" and provide solutions, the attendees would be happy.
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You pay a lot of attention to words and language. I've watched all your talks, and whenever you show the code, it "speaks for itself," and has a high signal-vs-noise ratio. A talk that shows developers how to write code that speaks human/domain language and gives a good reason for doing so can make developers rethink how they see and write code.
Ideas/suggestions are welcome.
Funny you mention this: someone contacted me this week about some possible work based on watching that Lean Code talk! Yes, we can go for this talk again, with some updates to reflect updates to my thinking (and slide choices).