Sling Media released their SlingPlayer Mobile for PalmOS to open beta this morning. It is officially supported on the Palm Treo 700p, but I know it also works on the Treo 680. How do I know this? I've been using it for the past month and a half in order to write this review for SlingCommunity.com. :-) Download it from Sling here and sync it to your Treo, or download directly from the browser on your Treo here.