I added two new features to subscription in calendar, news, and new gallery.

RSS enclosure support (pictures)
While you have been able to subscribe to RSS feeds for awhile, there wasn't support for enclosures. Enclosures are used to reference supporting files, usually images. Now, any images, audio, or video associated with an RSS article are included with each imported article. It references the picture on the original site, rather than copy it to Sitemason. Along with standard RSS enclosures, Sitemason will also read Yahoo Media Extension enclosures. There is specific support for Flickr's various image sizes to make Flickr subscriptions work pretty seamlessly with the new Sitemason Photo Gallery.

ATOM subscriptions
RSS is used almost everywhere, but the competing ATOM standard still shows up on occasion. Flickr defaults to ATOM feeds and Google Calendar provides ATOM feeds and no RSS feeds. Now you can add ATOM feeds to the subscription manager just like RSS feeds. As with RSS, Sitemason optionally converts ATOM categories into tags and uses ATOM enclosures.

Along with Flickr, you can subscribe to YouTube RSS feeds and Google 
Calendar ATOM feeds. Live on the Green http://www.liveonthegreen.net/ 
pulls from both Flickr and YouTube automatically.