I once set up a Yahoo group for TDC, thinking that it might make it easier for back-and-forth discussions among us Taiwan vets. It never really took off, so I closed it a couple of years ago. However, I recently set up a US Taiwan Defense Command group on Facebook, since so many people already have a Facebook account.
Check it out at http://www.facebook.com/groups/181370945250687 and post whatever's on your mind. If you don't have a facebook account, it's easy (and free) to join. Just go to www.facebook.com.