Some of the tutorials that I've read on multi-site suggest that it should only be used on a new instance of WordPress. I have a 3 year old blog that I'd like to convert to multi-site. The existing site will remain the main site, but others will be added.
Can I create a new instance WP, configure for multi-site, then import the existing site using the XML import feature?
What are my options? What are the gotchas?