Here's some info on that "Address family not supported" bit. It appears the most you can do is subdue the error message, but then you risk not getting information if that error occurs on the real IPv4 socket. Alternatively, I suppose you could re-compile the kernel to support IPv6, but I doubt that is worth the trouble.
http://www.thescripts.com/forum/thread172735.html

Anyhow, I've tried 3 other feeds with identical results. I'm running OS2008 51-3 with a N800. Virtual memory is turned off.
slashdot.org/index.rss
feed://www.macnn.com/macnn.rss
feed://crave.cnet.com/8300-1_105-1.xml

- Jim