Today I found out about the SP1 for windows 2003, I was not confident about installing it on the online server before reading some reviews about it and also testing it out on our development machine first.
Installed the SP1 on the local machine, SP1 is around 337 MB, quite a big download, after installation nothing got broken so thats a good indication :). It is focused towards security, and contains loads of security enhancements
SP1 is suppose to provide the following features.
Although I did come to know that SP1 does have problems with SBS