As scheduled, Fedora Core 6 was released on October 24th, 2006. I’ve upgraded a Dell PowerEdge to FC6 but that was after creating a bootable CD. Apparently, the diskboot.img that is used to create bootable USB flash drives wasn’t working for me.
Upgrading FC5 to FC6 had a few issues like an i586 kernel being installed instead of an i686 kernel but for the most part, the server is doing everything it should be. All services, CVS, Apache, Postgres, MySQL, MediaWiki are functioning fine without any changes.
I haven’t been able to get FC6 installed on an external USB HD for use with my MacBook so my ability to play with FC6 is very limited. I hope to get FC6 running off an external USB HD but all initial research indicates that it "should" work. I’ll let everyone know if I get it working.