Hi Nate,
You'll need a Subreport to be able to do this!
The Main Report would calculate these totals which would then be sent to a Subreport (via the change subreport links as an unlinked prompt). The totals would need to be sent as a comma delimited string.
Using further formulas inside the Subreport to break the comma delimited string, you can then sort based on the results.
Some project!
-Abhilash
