They definately showed up at some point during that pregnancy (for me as well) but ours was well established long before we popped the babies out.
It probably had fewer pages, though, because yours was a more condensed group. We were all coming off of having single threads, so the chat threads were catch-alls. DDCs were smaller, too; Lots of people seem to pop in and out now, whereas the June group was pretty cohesive the whole way through.
I think a bit more condensation could help here, too. I mean we've already got two threads for nursing mamas, you know?
I'm just geeky, though, and I like things to be tidy.
As to keeping a list at the top of each chat thread-- that strikes me as silly and making a lot of work (and I like lists!). HOWEVER, I think it'd be a FANTASTIC thing if the person who started the weekly chat thread could remember to post a list of separate group threads, ideally linked. F'rinstance:
Nursing Mamas Thread
First Timers Thread
Fat Mamas Thread (i want my own tribe, damn it!
Belly Pics Thread
And on like that. it would keep things neat and tidy, and provide a quick reference to other threads. It'd also let people know what was in this DDC without forcing them to sift through the pages.