There’s no “master” account that can see all of your directories for each user, no. Users are given their own directory (ie. /home/mousee).
You could however create a custom group (via the panel), chgrp all of your directories under your 2nd user’s account (via ssh, which you’ll need to enable via the panel as well), and give access to that group to your main user. Then you could access the other user’s directories… but only via SSH I believe, unless symlinking works, which I haven’t tried.
More info about such things can be found in the [urlhttp://wiki.dreamhost.com/index.php/Main_Page]DH Wiki[/url]. It would be a rather complex, advanced setup though… so I don’t really recommend attempting what I described above unless you’re comfortable working in a *nix environment