I love the Planet feed aggregator, but I hate managing it via a text configuration file. I created a WordPress plugin that automatically creates a Planet configuration file from the links that are stored in a WordPress database. Every time a link is updated, deleted, or created, a new planet configuration is generated.
For more information on how to install and configure the plugin, visit the plugin’s homepage. The source code for the plugin is hosted at wordpress.org.
A few coworkers and I launched Streetsblog.NET yesterday. The website is actually a vanilla install of WordPress working in conjunction with a vanilla install of Planet with a bunch of custom WordPress plugins. I will release the plugins when I get some time to clean them up.