JWMiddleton - Oh yeah...NT is much better than 98SE, especially for VLARs. I'm now running the nt40 file system option for WINE on my fastest Linux box because of that. Even if VLARs come through, it'll process them a little faster than 9x would and in general, the CLI itself is more optimized and processes 1/2 hour faster than the native Linux client anyway.
I know of people who are segregating their VLARs as you suggest and one recommendation was to set up 2 instances of Setiqueue and manually move the WU types to a specific one. Then you point the machines that will best process that WU, to the appropriate queue. That'll probably screw up the setiqueue log but at least you get the most efficient processing - especially during those times when large groups of VLARs get sent out and end up becoming a significant portion of the total queued WUs.
I know that the above is inpractical for large farms of machines but for the home user with a good number of machines, it is do-able.