A word on Yahoo pipes
The name choice is obvious for all UNIXers out there. UNIX Pipes is a great command line way of routing output of one tool as input for another tool. Yahoo pipes is doing the same thing with RSS feeds. With a few clicks you may sort, count and combine feeds at your leisure. Think of it as a feed construction kit.
It is still a beta and it has some problems, such as the Sort widget sorting dates in alphabetical order. But don’t let that stop you from trying it out today! All you need is a Yahoo ID.