About the River2 aggregator. It's running on your server. It reads RSS and Atom feeds and presents you with the lastest news in a river format, newest items first.
How to install Radio2. It's the next generation of the blogging tool I worked on in the early days called Radio. But it's simpler and it does more.
If you want Radio2 to shorten URLs and track clicks, you must set up an account on Adjix and enter the settings on the URLs page.
Hook up your Radio2 feed to Twitter using TwitterFeed. Powerful combo. Small pieces loosely joined. 
Install the OPML Editor on your desktop. A lot of things on the server work better if you're running the editor on your desktop.