Interestingly, the linked Wikipedia article for the 6-state, 2-symbol Busy Beaver machine now has one listed that is a whole meta-order of magnitude busier than then one Eliezer refers to.
Today's post, Abstracted Idealized Dynamics was originally published on 12 August 2008. A summary (taken from the LW wiki):
A bit of explanation on the idea of morality as "computation".
Discuss the post here (rather than in the comments to the original post).
This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Moral Error and Moral Disagreement, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.