I had to do the following modifications to get it work with libgdal-1.7.2

--- map.py.ori 2011-04-08 15:59:56.000000000 +0300
+++ map.py 2011-04-08 16:01:01.000000000 +0300
@@ -125,7 +125,7 @@
in_ds.SetGCPs( gcp_list, in_ds.GetProjection() )

out_srs = osr.SpatialReference()
- out_srs.ImportFromEPSG(900913)
+ out_srs.ImportFromEPSG(3857)
out_ds = gdal.AutoCreateWarpedVRT( in_ds, in_srs.ExportToWkt(), out_srs.ExportToWkt() )

gt = out_ds.GetGeoTransform()