customizing vendor drops for use on multiple projects

I've attached an image to try and visualize what I'd like to do with svn...

Given the example:
My vendor is: WordPress, I need to keep up to date with latest stable
releases: 2.0.1, 2.0.2, etc.

I'd like to customize a few things about WordPress in one location
that I can use across all my sites: ie: modify some templates,
features

I still want to be able to customize on a site-by-site basis as
well...ie: database.conf, environment.conf, logo.png, etc. etc.

Can someone help me run through the commands that are involved at each
stage (layer) ?

Thanks.

-- 
Anthony Ettinger
408-656-2473
http://anthony.ettinger.name
@pets = Pets.find_all_by_species('dog')
@pets.each do |dog| {
 if dog.name == 'Farley'
 dog.nick = 'Sir Barks-A-lot'
 elsif dog.name == 'Bonita'
 dog.nick = 'Princess Boo'
 else
 dog.nick = 'Doggie?'
 end
}

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