Re: Group Avatar
@whitbyglennk codebases of WP single and WPMU were merged in version WP 3.0. You can now enable multisite (create a network) from WP 3.0+ installation. If you are considering going multisite, you must fix any path or permissions problems you have in single WP install (at WordPress.org forums) before Creating a Network. And, you must Create a Network and test it per link I gave you above BEOFRE installing BuddyPress, otherwise it’s going to be a bumpy ride
EDIT – too slow posting