NetNewsWire 1.0b14 adds a new command to the Services menu: Subscribe in NetNewsWire.
When you select text—the URL in the address bar of Safari or Chimera, for instance—you can choose the Subscribe in NetNewsWire command to subscribe to the site associated with that URL.
NetNewsWire of course uses RSS auto-discovery to find the RSS feed, if the selected URL doesn’t point to the RSS feed.
Other changes in this release include support for Blosxom sub-sub-folders, sub-sub-sub-folders, and so on.
More details are on the change notes page.