Bad news! I thought, it's only a missing checkbox in the new volume-
applet.

Infos that could help solving this bug:
Have a look in the "Sound Card Properties" of gnome-alsamixer. Is "Headphone 
Jack Sense" just hidden? (see my attachment)
Are you able to mute speakers and headphones separately using another OS (like 
MS Windows)?
What audio hardware do you have exactly? Open a Terminal and enter:

  lspci | grep -i audio

Mine is:
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW 
(ICH6 Family) AC'97 Audio Controller (rev 03)


** Attachment added: "Enable all Sound Card Properties in gnome-alsamixer"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/414746/+attachment/1517588/+files/gnome-alsamixer.png

-- 
speakers cannot be muted when using headphones regression (karmic)
https://bugs.launchpad.net/bugs/414746
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