The sgml-common-0.6.1 package, which is a dependancy for an "emerge kde" command does not exist on any download servers and also is not listed in the packages page. Hence an "emerge kde" fails when it cannot download this package! Apart from that keep up the excellent work.
The latest package is sgml-common-0.6.3, which downloads ok. The sources for the older package are no longer available. Please update your portage tree (it's a recent fix). Tell me if that works.
Must have worked since you didn't respond.