You're right, my bookmark for the Zephyros Owners Thread no longer works. Shame.
When I was subscribed to that, I started receiving spam sent to the email address I used with OM and calling me by the user name I had on there.
That email address and user name were unique to OM, I did not use them anywhere else at all.
I couldn't find anywhere on the site to unregister but I found a contact address and asked. This turned out to be the site editor, he was puzzled how it could have happened, and he deleted my membership for me.
I also used to have a bookmark for the gear reviews, but I removed that long ago because they hadn't been updated for a few years. EDIT: I also have Buachaille bookmarked for gear reviews, but they are as old as the hills as well. Looks like it's time for me to delete that one, too.