Great extension, but it has its flies. The biggest one is that I can't sort portfolio items by creation date.
I'm not a programmer but I tried to modify it and it works so far.
So a guide for others….
/components/com_spsimpleportfolio/models/items.php
find on line line 74
list($order, $direction) = explode(':', $params->get('ordering', 'ordering:ASC'));
replace
list($order, $direction) = explode(':', $params->get('created', 'created:DESC'));
This will cause the most recent items to be on top.
Please consider checking and adding this option in the next update.