The SRC_URI for arts-1.0.5a is currently SRC_URI="mirror://kde/stable/3.0.4/src/${P}.tar.bz2" I think this should be SRC_URI="mirror://kde/stable/3.0.5a/src/${P}.tar.bz2" emerge of arts-1.0.5a is currently failing with "file not found". I have locally editted the ebuild file for arts and can get things to progress.
thanks for submission, was fixed earlier in cvs.