bill - 1:45 am on Mar 7, 2008 (gmt 0)

hmm...
I don't use WP so I'm not sure what you can do exactly, but couldn't you publish the feed to a password protected directory outside this cookie authenticated site? Then you could still keep the feed secure and still use many of the popular aggregators out there.

Even FeedBurner has a password protection option you could use...