Planet is also a flexible feed aggregator. It downloads news feeds published by web sites and aggregates their content together into a single combined feed, latest news first. It uses Mark Pilgrim's Universal Feed Parser to read from RDF, RSS and Atom feeds; and Tomas Styblo's templating engine to output static files in any format you can dream up.
Planet requires Python 2.2 or greater installed on your system. It requires only python-bdb, everythingelse is included in the Planet distribution. - http://www.planetplanet.org/
see for example: