Wrong homepage in /usr/portage/app-emacs/emacs-jabber/emacs-jabber-0.8.92.ebuild. http://emacswiki.org/cgi-bin/wiki/JabberEl should be changed to http://www.emacswiki.org/emacs/JabberEl.
Looks like the migration of EmacsWiki to a new host has broken some URIs. A quick scan produces the following list of packages to update: app-emacs/color-moccur app-emacs/crypt++ app-emacs/df-mode app-emacs/dropdown-list app-emacs/emacs-jabber app-emacs/emacs-wiki app-emacs/emms app-emacs/folding app-emacs/icicles app-emacs/inform-mode app-emacs/mcomplete app-emacs/mldonkey app-emacs/moccur-edit app-emacs/regress app-emacs/rfcview app-emacs/stripes app-emacs/tempo-snippets
All fixed, closing. Thanks for reporting!