ooh that would be super cool. If 32bit linux can do 64gb im sure MS will not have a problem getting 4GB to work.
Sp1 according to the release notes does not actually enable a 32bit os to use 4 gig of ram. All it's going to change is allow the control,system properties,etc to display that the system actually has 4 gig of ram. The 32 bit os will still not be able to use all 4 gig's of ram, it still suffers from the limitations of 32 bit os.
So instead of showing what memory is available to the os it will show how much memory is installed.