Our mailing list is maintained on Google Groups. Information on the mailing list can be found here, and the list itself here.
Many DUSAC members are on Facebook, so a few years ago we set up a page for sharing photos and chatting. You can find it here
We have a Twitter account at twitter.com/trinitydiving where you'll find tweets of DUSAC news items and committee blogs. The plan is to use our Twitter account to announce events such as public talks, sign-up dates etc. These will, of course, all be announced on dusac.org too.
We've not got a whole lot of videos from club members yet, but as and when we do, we'll tag them on our Youtube page.