All Of Me, a new lifestream visualizer is out in closed beta. Although they don't offer an RSS feed importer, they link to flickr, YouTube, Twitter and Picassaweb and will soon add Facebook and Google Calendar. You can also upload local images, videos and web pages from your computer. One nice unique feature out soon is a playable, embeddable widget that comes in a number of styles.
I have 100 beta invites to share, so feel free to give it a try.