the http://dl.google.com/linux/talkplugin/deb/pool/main/g/google-talkplugin/google-talkplugin_1.8.0.0-1_amd64.deb is not avalble so www-plugins/google-talkplugin-1.8.0.0 cannot be installed
I know that would happen at some point, google tend to remove the obsolete versions and gentoo can not mirror it, but at least the x86 version is still around: <http://www.google.com/search?q=intitle:%22index+of%22+google-talkplugin_1.8.0.0-1_i386.deb>
Added fetch restriction to ebuild.