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RSS Mixer is a new service that will combine all of your feeds into one. A feed aggregator, if you will.
Take your favorite feeds and combine them into one. RSS Mixer will provide you a URL with your master feed, along with downloadable widget options and formats, including one for your iPhone, one for your personal website or blog, a regular RSS feed, and an Apple dashboard widget. There are a couple badge options as well, if you'd like others to grab your feed. The main feed page shows a list of these options for others, as well as a running list of the feeds included.
This service sort of boils down to Jaiku or Twitter without the social network, if you've ever used one of these micro-blogging tools to show your blog updates automatically. The service is very simple to use, and could be a great fit for a service like Profile Builder, and profile aggregating services such as Tabber.