Planet Atom is now live.
Planet Atom focuses Atom streams from authors with an affinity for syndication and Atom-specific issues. This site was developed by Sylvain Hellegouarch, Uche Ogbuji, and John L. Clark. Please visit the Planet Atom development site if you are interested in the source code. The complete list of sources is maintained in XBEL format (with some experimental extensions); please contact one of the site developers if you want to suggest a modification to this list.
John, Sylvain and I have been working at this on and off for over a month now (we've all been swamped with other things—the actual development of the site was fairly straightforward). Planet Atom is built on an aggregation from Atom 1.0 feeds into one larger feed (with entries collated, trimmed etc.) It's built on 4Suite (for XSLT processing), CherryPy (for Web serving), Amara (for Atom feed slicing and dicing), atomixlib (for building the aggregate feed) and dateutil (for date wrangling), with Python and XML as the twin foundations, of course. Thanks to folks on the #atom and #swhack IRC channels for review and feedback.