Shrook is a desktop RSS aggregator for Mac OS X. As opposed to NetNewsWire, it allows you to keep an online version of your subscriptions available to you through any browser at Shrook.com. Your subscriptions are also shareable.
It is shareware that costs $19.95. Something I might consider investing in. Ideally, I would like to synchronize my Drupal and local subscriptions, perhaps by sharing an OPML file online.