The acme daemon places an icon in the notification area.  This icon appears
to serve the following purposes:

  1) informing the user that acme is running

  2) providing access to the acme preferences

  3) vanity, through the About option


As acme now appears to be a standard part of GNOME, and therefore always
*should* be running, (1) is not necessary.  famd doesn't have one, gconfd
doesn't have one, so I don't see any particular reason why acme should have
one.  If it is import that acme always *be* running, it should be respawned
through session management.

The "Multimedia Keys" preferences are available from the "Desktop
Preferences" menu + folder, a far more 'obvious' place for them to be. 
There's no benefit gained from having access to the same preferences dialog
take up room in the notification area, so (2) isn't necessary.

The more icons in the notification area, the less useful it becomes as a
*notification* area.  An icon for vanity only shouldn't even be considered
worthy.