Among other changes pushed today, we've stopped showing group pages to non-members as per Sean's instructions. This applies to the groups that were previously "boards" as well. The status of former boards may be changed in the future, or we may let groups choose whether they would like to be fully public or members-only in the future, but for now all groups are effectively members-only or private.
cockzombie:
Great. Please don't change this without emailing all members, including former members. :)