Meta Tag Title

Hi,

I am using twenty ten theme, and I want better meta title and description for my ‘is_tag’ title. Currently I am having the PHP :-

For example if Tag is ‘Work’ – I want the Meta Title should be

Work (79 Things have been added)

and in description – 79 things have been added in as ‘work’

Pl guide me what changes to be done in below PHP –

<?php
$blog_title = get_bloginfo('name'); 

if (is_home()) {
    $blog_title = get_bloginfo('name') . " - " . get_bloginfo('description');

}
if (is_single()) {
    $blog_title = get_the_title() . "   " . get_bloginfo('name');
}
if (is_category()) {
    $blog_title = single_cat_title("",false);
}
if (is_tag()) {
    $blog_title = single_tag_title("",false);
}
if (is_page()) {
    $blog_title = the_title('','',false);
}
// Add a page number if necessary:
	global $page, $paged;
	if ( $paged >= 2 || $page >= 2 )
		$blog_title .= ' | ' . sprintf( __( 'Page %s', 'twentyten' ), max( $paged, $page ) );
?>
<title><?php echo $blog_title; ?></title>