Significantly raise the minimum karma level.
Another technical solution. Not trivial to implement, but also contains significant side benefits.
Some karma + passing test gets top posting privileges.
I have to confess I abused my newly acquired posting privileges and probably diluted the site's value with a couple of posts. Thank goodness they were rather short :). I took the hint though and took to participating in the comment discussion and reading sequences until I am ready to contribute at a higher level.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
July Part 1