iWatcher feeds are a little bit different: you are able to select/deselect groups of tags through the feed URL (feature inspired on LifeHacker).
poll everything except ringtones neither themes;
only Ripdev releases;
all themes, except those battery related;
only mobilesubstrate, system and utilities.
Of course, you still can sign the complete feed: http://iwatcher.net/rss2
P.S. – the filter plugin I developed specifically for iWatcher currently supports only the RSS 2.0 format. I hope to implement “everything else” and release the plugin publically soon.