Gnome 2 had a very compelling and great feature of the clock in the panel: It was able to show multiple time zones and the current weather in these locations. Even in Gnome Shell 3.4 this outstanding feature is still missing. This is badly needed and in Gnome 2 this features collecte many "wow quite handy and cool" comments.

IMHO it would be the best to simply replicate the feature of Gnome 2: There was nothing to improve on: https://wiki.ubuntu.com/HardyHeron/Alpha4?action=AttachFile&do=get&target=intlclock.png 

Thanks in advance!

I know that for Gnome 3 Shell this feature was already discussed, but I was surprised that there is no related bug entry. If there is one which I couldn't find, please set this one here as duplicate.

Other related links:
http://askubuntu.com/questions/95346/world-clock-in-gnome-shell
http://mail.gnome.org/archives/gnome-shell-list/2012-February/msg00073.html
https://github.com/gnome-design-team/gnome-prototypes/tree/master/clocks/
http://justinstories.wordpress.com/2011/05/26/ready-for-gnome-3-2-world-clock-comes-to-gnome-shell/