usb flash memory based automatic podcatching

This whole podcasting thing has taken off, thanks to the iPod phenomenon.  The people at  “Social customer manifesto”  have now have figured out to how to create a cheap podcatching device using a USB flash drive.  It is cool ! I was wondering if someone can do a portable RSS Feed Catcher so that  you can carry your favorite feeds (expanded of course)  with you to read on planes/trains etc.  Even if the first  level of links in the RSS feed are expanded, that would be sufficient.