My wife and I have bought a Z3, and having found forums for our previous cars really helpful, I though I'd join one for the Beemer! (I've found ZRoadster.net too)
We're loving the Zed at the minute and have even had chance to get the top down despite it being freezing cold!! Here's a pic...
For those of you who are interested in cars in general, here's a pic of my daily driver, an old Mk2 GTI (I love it!):