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This doc explains the way to create geoprocessor object in ArcGIS 9.3:
The first table under "Comparing the 9.3-version and 9.2-version geoprocessor" in the above doc shows the differences between using ListFeatureClasses with a 9.3-version and 9.2-version geoprocessor.
You would use the following code, instead of the Dispatch:
gp = arcgisscripting.create(9.3)
Hope that helps.