Thanks for your reply, I'd read the eBook. I'm selecting options that are there, and I understand what the options mean, it's just that I don't know the "trick" to get community.domainname.org/userblog/ to work.
This isn't going to work because of the DNS wildcard: userblog.community.domainname.org
Is it true that the only way to get MP MU to work out the box is to install into the root directory of a domain and to select subdomains?
I read on your forum that you are providing limited support for BuddyPress. That's really all I'm interested in actually. Would it make sense for me to join?
Best,
Dainis