I like the use of the gnu's horns turned sideways as an 'E'. It has a fairly
clear interpretation yet still has a subtle connection to the gnus logo. The
Swiss army knife, kitchen sink, and gnu icons always leave me grasping for
meaning and/or even recognizing what the icon is.

A couple of comments related to Tango have been made, so I'll add a comment
on that.

The Tango style guidelines (
http://tango-project.org/Tango_Icon_Theme_Guidelines) say

   - All Tango icons are stroked with a thin outline
   - Use glossy reflection only on objects that have a reflective surface
   in real life

Stroking the 'E' and reducing the gloss would bring the icons more in line
with Tango.

Best,

Kevin Wright