It would be nice to have a "Network Monitor" applet.
Both Gnome 2 applet and GnomeShell extension
of "Network Monitor" already exist.
Starting from "NetMonitor Lite" GnomeShell extension
could be good point...
I just published my network speed monitor. It's here: http://cinnamon-spices.linuxmint.com/applets/view/18
@r0polach Please close this issue since the applet is available for download at cinnamon-spices.linuxmint.com.