I've tested WP-Super Cache on both a Redhat 4 and 5 OS, and on the current 2.3.3 WordPress. I've tried both ATOM, and RSS delivery to Feedburner, and have no problem at all with WP-Cache, but once WP-Super Cache is installed suddenly the news feed won't work in IE or Omega Pro 2.2 news feed reader. In Omega I get the error:
Reference to undeclared entity 'rsquo'. Lin 91, position 696.
I've also noticed my traffic from Google declines as well, even though using the mod-rewrite isn't supposed to have an SEO impact.