kekekeks/skypetab-ng — Issue #25: invalid *.desktop file
Author: Ri0n
Created: 2011-12-21 10:28:24+00:00
State: open

as far as I remember X11 specs, Icon element should be set to full path or just file w/o extension.
so "skype.png" is not valid value. should be just "skype"

PS I've added gentoo ebuild into my overlay http://code.google.com/p/rion-overlay/source/browse/net-im/skypetab/skypetab-9999.ebuild . works fine on my amd64 box =)