I studied RSS in detail a while back for Aggreg8 and for my Content Syndication presentation (also on Google Base). I’ve only just now revisted the spec and was quite taken aback that there is only one enclosure allowed per RSS item. Quite a limitation considering the wealth of media (images,videos,audio) being published and syndicated these days. There was talk about changing this in a future version or extending RSS 2.0 (using namespaces) or using mediarss but nothing seems to have made it back into the official RSS spec – or have I missed something?. Atom allows as many as you want using the atom:link element.