Yes, that’s right, the page announcing it is in CVS, but not on the main site.
But actually, flac taking only 10% of Kuroboxes CPU was the flac included in Debian, which is 1.1.1, so its quite old and still fast enough for the Kurobox.
Probably should update that soon… hmm… I don’t like moving away from official Debian packages, but newer flac versions brought nice things like album art in metatags, not sure if that would work with the old version installed (Firefly has its own parser imho, but not sure about Slimserver).