Re: A newbie question about trunks
SVN (command line via Terminal) is also built in to Leopard. Just cd to your wp-content/plugins directory and do:
svn co https://svn.buddypress.org/trunk buddypress
This will check out the trunk to the ‘buddypress’ directory. Any time you want to update trunk simply browse and do:
svn update buddypress
Cheers!