There's now a group in Google Groups called LW Helsinki, it's a closed group so you'll need to request a membership. I'll soon put a short description about this in the LW wiki together with the group's e-mail address. I'm not too familiar with Google Groups but I understood that it can basically be used as an e-mail list (probably with some fancy extra features). It also saves all sent messages for later viewing, i.e. new members on the e-mail list can easily catch up on past discussion.

Short summary for Helsinki LWers: click here and request a membership.