LW discussions of anthropics in Tegmark’s multiverse:
http://lesswrong.com/lw/1zx/addresses_in_the_multiverse/
http://lesswrong.com/lw/535/anthropics_in_a_tegmark_multiverse/
http://lesswrong.com/lw/572/the_absolute_selfselection_assumption/
If you look in the comments of these posts you’ll find more links to earlier discussions.
LW discussions of anthropics in Tegmark’s multiverse:
http://lesswrong.com/lw/1zx/addresses_in_the_multiverse/
http://lesswrong.com/lw/535/anthropics_in_a_tegmark_multiverse/
http://lesswrong.com/lw/572/the_absolute_selfselection_assumption/
If you look in the comments of these posts you’ll find more links to earlier discussions.