I've just received notice of the TC Alternate List. It is too early to see whether this will take root or whether there is general appetite for a list in addition to Wieland Willker's one.
The blurb is as follows:
"This is an alternate Textual Criticism group for people with a wider set of views and more diverse backgrounds than just 'university scholarship'.
This group allows discussion of other related topics, like theology and doctrinal issues, as well as humour and politics.
Anonymity is allowed. Credentials are not required or desired. All participants should and will be judged based upon the content of their posts only. Please stick to one name only."