Imagining that your RSS client does not support filtering or rules, you can use these to get the filtering performed directly on the server. Can be convenient.
Exactly, that's the issue I have with Google Reader (such an obvious functionality is missing). Now I can categorize my news within one feed by using this tool.
Someone make this for twitter please! A big problem with twitter is that most active users use it for everything from communicating with their significant other to sharing industry news. In most cases, I am only interested in the industry news-related posts when I follow someone and yet, over 50% of my twitter feed(no matter how hard I try to filter) is full of random conversations not reflective of my interests. For the longest time I thought the problem was the group of users I was following. So I removed almost everybody and cut it down to under 20 at one point. It didn't help much: my feed remained dominated by mostly random conversations.
Just tried it, really cool tool. I hate subscribing to the feeds of big tech news sites because there are a lot of posts I don't care about. Being able to filter it like this is really useful. And in 4 hours! Good job.
Thanks a lot, glad you liked it. I understand your pain (I was once subscribed to Mashable main feed) :-)
There's a number of existing services (like http://www.feedrinse.com/) but I really wanted to make it as simple as possible (no sign ups, no fancy UI, easy to use and free).