I believe you're supposed to link to a past post you feel is valuable enough that people who missed its initial appearance in discussion should go back and read it. The idea of this thread being that you don't have to create a new post and clutter up discussion to do so.
They don't create a new discussion post drawing attention to an old thread once a week, no. Whether there is one person a week who would make the same post in a less obtrusive thread dedicated to such posts is another question.
The existence of the Open Thread complicates the issue a bit as well.
http://lesswrong.com/lw/ily/a_concise_version_of_twelve_virtues_of/ I recently re-read the twelve virtues and found some new connection to my developing rational self. I was able to congratulate my progress on some areas, and remind myself to keep it up! I am becoming natured in the way I want to be.
Meta: The likelyhood that the most value has been gotten out of a post that shifted below the first page due to its age is low. I have been thinking about how to change this recently. This is probably a good start.
Quasi-bump: Why doesn't Less Wrong pay more attention to Andrew Gelman's blog? He wrote Less Wrong's favorite bayesian statistics textbook and blogs about social science... seems like he'd be right up our alley. (I just posted in an old blog recommendations thread but I don't really expect anyone to see that so I'm cross-posting here.)
Recently I came across the Akrasia Tactics Review article, then a 'bump' thread which spread the relevant content over multiple places, making tracking the content harder. It's apparent that some people believe some Lesswrong articles may be undervalued by the community (after factoring in karma as an indication of the community's appraisal)
Bump threads crowd out new articles and may annoy the more comprehensive or more experienced readers. This article is prototype for a regular (or whenever anyone else wants to take the initiative to start one) discussion board thread where people can lobby for increased visitation to articles of their interest. Don't make the threads run for too long - 1 week as a guide. Tag them with bump_thread
Future thread starters should not suggest an article in the initial discussion post, as I have. Although, this is useful as a guide for what I have in mind.