Also rooting your Galaxy S i9000 allows you to use more apps and widget, along with doing basically everything you want with your device.
For as long as smart phones has been around there has always been updates to their software.
Phone manufacturers has always been in a hurry to get new products out to a hungry audience waiting for the next big thing to hit the cell phone market.
Connect your device to your computer using your USB cable, then download the Software Upgrade Assistant tool to your computer, which will check for software updates and initiate the software update process.
The current software update gives you the most up to date Android security patches on your device.
However, this only means the software didn't install properly.