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 define('WP_HOME','http://newsite');
 define('WP_SITEURL','http://newsite');
 define('RELOCATE',true);

 UPDATE wp_posts SET guid = REPLACE (guid, 'http://oldsite', 'http://newsite');
 UPDATE wp_posts SET post_content = REPLACE (post_content, 'http://oldsite', 'http://newsite');
 UPDATE wp_postmeta SET meta_value = REPLACE (meta_value, 'http://oldsite', 'http://newsite');

What's missing?

Go through all options, load serialized values, replace in there, save again. If you do, do it before the SQL replace commandos.

See Also

• Staging
• Moving WordPress (Wordpress Codex)
• Changing The Site URL (Wordpress Codex)
• Updating links in old posts when things change (Wordpress Support Forums)