These guidelines were provided by Dave Kulju

This isn’t a comprehensive list but here are some of the ones I remember…

skinbase() 

changed to

skin_base_tag()

$Item->Author->prefered_name()

changed to

$Item->author()

$Blog = Blog_get_by_ID( $blog )

was not longer valid so I had to replace it with

$BlogCache = & get_Cache( 'BlogCache' );
$Blog = & $BlogCache->get_by_ID( $blog, false );

$Item->permalink()

changed to

$Item->permanent_url();

if( !defined('DB_USER') ) die( 'Please, do not access this page directly.' );

changed to

if( !defined('EVO_MAIN_INIT') ) die( 'Please, do not access this page directly.' );