We have been using a dual boot system in our classroom for about a year. In our case we wanted to use XP and Vista. I posted somewhere in this formun how I did it but here are the basics again. You will need 3 partitions. One for XP with office 2003 and XP and 2007 on the other. The third is for your saved files. This last partition only has to be as large as the files you need to save. In our case we also teach movie making which makes this fairly large. In your case you propably will want to make the data partition as small as possible or if you dont save any files from class to class you don't need it at all. Another option is to use flash drives as your save medium. We could not because of the size required.
When you create your partitions I would recommend that you make them primary partitions and name them so you know what the partion does, i.e., XP2003, X2007, Data. After you install SS and before you lock down the student user, you want to map My Documents to the Data drive for both OS's. Also in the student restrictions you need to hide the drive that contains the partition for the second OS and Office version. This is why I recommend naming the partitions so it is easy to figure which one to hide. The C: and D: and E: definitions will be different partitions depending on which system you boot. If you don't hide the unused partition and a student writes to this drive it will corrupt the steady state protection on that drive.
In the case of Vista and XP, I installed XP first and then installed Vista from the XP OS. If you install from XP, Vista will give you a choice of upgrade or clean install and if you do a clean install on a new partition, it automatically generated the dual boot function. I don't remember if XP will do the same thing, if not, there are several free boot managers on the internet.
