Recently I was invited to yet another "TC-list", i.e. a discussion list focusing on textual criticism of the OT and NT. Once upon a time there was one TC-list run by James Adair and Tim Finney. This list died out, and now there are three (to my knowledge):
Textual criticism, founded April 23, 2004
496 members; 23 messages in Dec 2007
Excerpts from the description: posts must be on-topic. contributors should be familiar with the contents of the web pages given in the Links section; moderated by Wieland Willker
TC-Alternate-list founded July 31, 2006
51 members; 51 messages in Dec 2007
Excerpt from the description: for people with a wider set of views; less formal atmosphere; "more freedom to discuss many related issues of interest (theology, doctrine, humour, politics); anonymity allowed; credentials not required or desired.
83 members; 90 messages in Dec 2007
Excerpt from the description: as little moderation as possible; discussion of the King James Version Only (or TR Only) viewpoint not tolerated; Each list member should be identified by given and last name
The first list, started by Wieland, filled the gap after the old TC-list. My guess is that the second list started because some people wanted to discuss Textus Receptus Only, KJV-only, or "wider issues" (e.g. doctrinal, etc). Perhaps some also felt surpressed because of lack of academic credentials (as judging from the list description). The third list, I suspect, also has to do with the moderation on the first list, but there is now an avoidance of KVJ-Only/TR-Onlyism and strict focus on academic discussion (which is good).
This is my highly subjective interpretation (full of guesses) of a development that is rather sad. Now we have three lists (and some seem to contribute to more than one). Time will tell if we have reached the peak.
Update: the second list, TC-Alternate-list, has been discussed on this blog here