This line is wrong, i couldn’t even get the theme options page up without changing it..
add_theme_page( "Satoshi Theme Options", "Theme Options", 8, __FILE__, 'theme_options_admin');
Update that to read something like..
add_theme_page( "Satoshi Theme Options", "Theme Options", 8, 'satoshi-theme-options', 'theme_options_admin');
Saving options did produce the updated message as expected.
UPDATE: Looks like the $_GET key has changed in 3.1 when performing settings updates.
Update the following line.
if ( $_GET['updated'] ) echo '<div id="message" class="updated fade"><p>Satoshi Options Saved.</p></div>';
To..
if ( $_GET['settings-updated'] ) echo '<div id="message" class="updated fade"><p>Satoshi Options Saved.</p></div>';
And you’ll now see the updated message when saving.