Previously I had been waiting until major releases of RSS Bandit were announced before upgrading. My installation went awry recently however, so I ended up uninstalling, downloading a nightly build version, and reinstalling. Boy was I glad I did!
Some of the coolest features about this feed aggregator are the ability to skin feed items, change the view to the Outlook 2003 reading style, and flag items for review, forward, etc. A feature not yet implemented in a build but one that I am eagerly awaiting is the Search Folders functionality found in Outlook 2003.
So if you are looking for an excellent aggregator with a bright future ahead of it, check out RSS Bandit!