Checking the ISA 2004 Version
The ISA In SBS Blog has a tip on ISA 2004 version numbering that covers how to check SP1 is installed quickly through the MMC.
For ISA Server 2004 Standard Edition, the RTM version is 4.0.2161.50.
To round out the versiony goodness, Enterprise Edition RTM is 4.0.3439.50.
