Question about All in one SEO.

I have noticed that there are All in one SEO settings for every post that you make on WordPress.

Is it beneficial to add this everytime I use it?

Thanks.

 

yes, better add it everytime..
if not, its ok too.

 

Yeah i make use of it for each individual post.

 

For some reason the all in one seo pack does not have any effect on my blog. I installed it changed all the settings but on the homepage the adsense ads are not relevant at all. I can see the seo pack actually works because it changes the title structure in the window. Anyone have any clue ?

If I use the all in one seo pack do I have to modify anything in this code :

<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />

<title><?php if(is_home() || is_search()) { bloginfo('name'); echo ' - '; bloginfo('description'); } else { wp_title('') ;} ?></title>

<meta name="generator" content="WordPress <?php bloginfo('version'); ?>" /> <!-- leave this for stats -->

in the header ?

I have to mention that I am using WP 2.5.1 is it compatible with this version ?