Every time I create a new site under 3.1, my first trip is to the Users > Admin User profile page to uncheck the "admin bar" checkbox.
I'd like to place a script in my theme's functions.php to do this automatically.
Anyone know what that would be?
You could use a function inside your theme's functions file to selectively disable it for specific users.
Then call it for the user or users you want to disable the bar for..
If you want to just turn it off altogether, then the following should do it(instead of the function).
Hope that helps.. :)
I believe you can activate such a plugin sitewide - http://wordpress.org/extend/plugins/disable-admin-bar/