Well, so far, I have received zero evidence for the existence of either gods or Matrix Lords. This leaves me with, at best, just the original prior. I said "at best", because some of the observations I'd received could be interpreted as weak evidence against gods (or Matrix Lords), but I'm willing to ignore that for now.
If I'm using some measure of algorithmic complexity for the prior, what values should I arrive at ? Both the gods and the Matrix Lords are intelligent in some general way, which is already pretty complex; probably as complex as we humans are, at the very least. Both of them are supremely powerful, which translates into more complexity. In case of the Matrix Lords, their hardware ought to more complex than our entire Universe (or possibly Multiverse). Some flavors of gods are infinitely powerful, whereas others are "merely" on par with the Matrix Lords.
I could keep listing properties here, but hopefully this is enough for you to decide whether I'm on the right track. Given even the basics that I'd listed above, I find myself hard-pressed to come up with anything other than "epsilon" for my prior.
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A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
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Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.