I was trying network-manager-openvpn plugin today on Lucid, I could import my configuration, DNS was set up correctly upon connection/disconnection, route imported correctly (almost :)).
One issue though is that it was also changing the default route to the VPN tunnel while this should not happen.
When you hotplug a hard drive in a virtual machine, the drive do not show in fdisk -l output until you reboot your VM.
In order to get the drive to appear, the SCSI bus need to be rescanned.
GTK+ offers a nice toolkit through the GDK library to make image manipulation quite easy.
This page will go through the process of modifying an image but putting another on on top as an overlay. In this example, we will be copying an MSN icon on top of a "busy" icon.
Another use case could be to watermark images.