Thought this would be a FAQ, but while I easily found a "theme changes needed" between the 2.8 and 2.9 versions, I'm wondering if anything really needs changing between 2.9 and 3?
The theme seems to work OK, but there's new and scary things I don't understand, like
<h2 class="center">Error 404 - Not Found</h2>
<?php _e( 'Not Found', 'twentyten' ); ?>
Basically, it it ain't broke, should I even be worrying?