Here's something else I wrote a while ago: a script that gives all the comments and posts of a user on one page, so you can save them to a file or search more easily. You don't need Greasemonkey for this one, just visit http://www.ibiblio.org/weidai/lesswrong_user.php

I put in a 1-hour cache to reduce server load, so you may not see the user's latest work.