Great idea to jump-start the conversation! Putting it in general has certainly increased the participation, it does feel a little like airing our dirty laundry in public though
There's been a lot of good suggestions already!
From me:
Website & Forum
It feels very unloved at the moment, old fashioned and not maintained. Good content is hidden and useful posts seem to disappear into the archives. I'm also surprised that there is talk of a need to support the site and forum. I'm pretty sure that a small site and forum like this could be hosted somewhere for free these days if needed. Moderation needs to be improved as threads routinely wander off-course or devolve into slanging matches. I have personally felt loathe to post on some threads because of the posting behaviour of some members. Good round-the-clock moderation is difficult so I doubt this one is an easy fix.
Why join?
As others have said, at the moment there doesn't seem to be a reason to join the club apart from a) being able to edit forum posts and b) the welcome pack. I don't think that the offering is strong enough to entice new members at the moment.
Online it would be nice if once you became a member there was a big archive of guides and info, databases of the cars and members online to access. I'm personally not that interested in a newsletter, but I think that everything that should be in one should be published as editorial on the website.
Offline, as a new member it was a little disappointing to see another club representing the Z's at a classic car show (NEC), especially as stands at shows is something that the club used to do. I've been a member for a few months but I'm still not sure when any local or national club meets are happening - if they're actually happening, they should be more visible as I'm sure any new member would like to see evidence of an active club.
Identity
There should be a conversation about how we want the club to be perceived from the outside and by new members. I agree with Sean that ZClub's site and members should be the first port of call for anyone remotely interested in Zs and the motoring press. The club obviously has a lot of history and we need to show it to people so they want to become part of. At the moment I don't feel like the website does that.
Classifieds
I have no problem with traders on the site / forums and they shouldn't have to support the rest of the membership, given the difficulty in obtaining parts it should be made as easy as possible for both members and traders to advertise anything they have for sale/trade. Having this open to the general public might increase timewasters but isn't any chance at that elusive part worth it?
Just my $0.02