/admin/index.php has these lines:

/**
 * You can choose the page you want as the default below:
 */
require( dirname(__FILE__).'/b2edit.php' );

If you create a new file for your page, you could just put its filename where b2edit.php is in the code above.

This technique does not seem to change the default link to the admin area from this:

user_admin_link( '<li>', '</li>' )

I know there is a way to edit the bits between ( ) to hard code the page the user is directed to but what I was hoping was that upon login the user would not be taken to what now appears as the default 'Tab' in the admin area (http://testing.nthview.com/admin/b2edit.php?blog=0), which is the post to blog 'Tab' but instead some other tab would be the default tab. I've looked in the _admin.php thinking it might be there but no luck.

I've created a sort of landing page (blog_home.php) with its own tab and had hoped to automatically redirect users to this tab upon login.

-Mark
Thanks

http://doc.b2evolution.net/0.9.0/evocore/_blogs_b2evocore__functions_users_php.html#functionuser_admin_link

user_admin_link( '<li>' , '</li>', 'blog_home.php' )

Just for info:
I've just committed a fix, so that the $page param for user_admin_link() defaults to '' (empty) and therefor will respect /admin/index.php in the future (from Phoenix-beta onwards).