WARNING: I had a massive eruption of ideas, so my post is not structured at all.
Im not even considering this application as a news tool. To me its like Growl for Mac, you can do a lot more with notifications if you know what youre doing. This application has some incredible potential or at least could give way to some lateral thinking. So far, just of the bat, I have several ideas that I could rapidly implement just by using RSS as a data output. If the developers add support for adding individual feed subscription there is so much that can be done with just that alone. For instance I work in the Legal/marketing domain and I can think of several corporate technologies that already work with RSS such as internal websites, project management systems, enterprise systems etc that push out feeds from their system. This can be used to get up-to-the minute info or status updates. You can quite easily incorporate it with a lot of technologies that have workflow editors and output to RSS.
Just as I am typing this, Ive already thought of another idea that I could rapidly implement. I have a simple shell script that runs as a CRON job on my Ubuntu server that downloads the 5 day weather forecast, pipes it through some commands to clean it up and outputs the display in XML (it was designed to work with Beryl the fork of Compiz with real-time weather, but I could change it) once the XML is captured, its pushed as RSS for weather updates or condition updates. For instance, if I had an outdoor event 3 days later, and I wanted to be updated about weather change from Sunny to Rain I could simply enter the keywords Rain in RSSPUSH and the date three days ahead. The CRON jobs run at regular intervals, the server downloads the 5 day forecast from the BBC, some data manipulation is carried out on the server-side to push the weather as a feed if it met my condition. This way I could get on with my week knowing that I would be updated by the hour (when CRON jobs run) if there was a weather change, so I dont need to check the weather all the time and can plan ahead. This is a really simple use, but if you can capture data, you can easily manipulate it to output as RSS feeds.
Ive also just realised that a lot of PHP project management systems can easily be tweaked to output data as RSS, so Tasks, Milestones, deliverables etc etc, can be pushed by the server as a feed for up to date information.
There is so many other things you can do with this app providing we are able to add subscriptions and while considering the lack of security RSS has, it can still be used to keep you up to date with other things such as Facebook notifications, Email notifications, server problems, if you know some coding then anything that you can do a lot with this.
If the developers do this right, and turn it into a Growl like application I can quite easily see web apps being built to take advantage of this. Think of Netvibes, publishing and pushing all your content, weather, news, email etc. There are so many other ways you can hack things to work with this app.
There is so much you can do with this app... This app could save the universe.