(This is my new username. I was formerly PaulUK.) Just a quick note to say that, after leaving the "Minds, Measure, Substrate and Value" series for a while, I am currently doing Part 4, which will deal with some of the objections that have been made by, among others, Less Wrong members, Part 5, hopefully, will generalize into a cosmological view, as opposed to one that is just about minds.
Paul Almond's site has many philosophically deep articles on theoretical rationality along LessWrongish assumptions, including but not limited to some great atheology, an attempt to solve the problem of arbitrary UTM choice, a possible anthropic explanation why space is 3D, a thorough defense of Occam's Razor, a lot of AI theory that I haven't tried to understand, and an attempt to explain what it means for minds to be implemented (related in approach to this and this).