I certainly haven't read all of this, they are just blogs that come to mind as being associated with rationality.
http://www.sebastianmarshall.com/
http://paulgraham.com/articles.html
http://www.delicious.com/tag/rationality
http://unqualified-reservations.blogspot.com/2007/09/how-dawkins-got-pwned-part-1.html
overcoming bias and perhaps other blogs have blogrolls that might be worth investigating.
I've done all those except delicious.com, because I don't know how to confine my spidering to just that tag.
One of my long-standing interests is in writing content that will age gracefully, but as a child of the Internet, I am addicted to linking and linkrot is profoundly threatening to me, so another interest of mine is in archiving URLs; my current methodology is a combination of archiving my browsing in public archives like Internet Archive and locally, and proactively archiving entire sites. Anyway, sites I have previously archived in part or in total include:
Having recently added WikiWix to my archival bot, I was thinking of re-running various sites, and I'd like to know - what other LW-related websites are there that people would like to be able to access somewhere in 30 or 40 years?
(This is an important long-term issue, and I don't want to miss any important sites, so I am posting this as an Article rather than the usual Discussion. I already regret not archiving Robert Bradbury's full personal website - having only his Matrioshka Brains article - and do not wish to repeat the mistake.)