Samsung Galaxy S stuck upgrading firmware. Should I unplug my phone? Should I keep on waiting? I tried to upgrade my firmware on my Samsung Galaxy S using Kies

The Firmware upgrade appears to have gotten stuck.

Kies says

Upgradeing firmware... Do not disconnect a mobile device from the PC during upgrade process
Progress Bar has "Upgrade is in progress.." and is stack at about 1/3

The phone screen shows a green triangle with Downloading... below it and "Do not turn off Target!!! at the bottom.

It has been this way for about an hour.

What should I do?

Should I unplug my phone?
Should I keep on waiting?

I really don't want to end up with a brick.
I disconnected the cable

Kies popped up an error message which said, the upgrade failed and offered to try to recover for me. 

By following the instructions on screen I was able to recover my device.