diff -r c13bca1c21fb virtconv/diskcfg.py
--- a/virtconv/diskcfg.py	Wed Jan 14 12:36:11 2009 -0500
+++ b/virtconv/diskcfg.py	Thu Jan 22 12:24:51 2009 -0500
@@ -235,7 +235,8 @@
 
         if not (out_format == DISK_FORMAT_NONE or
             out_format == DISK_FORMAT_VDISK or
-            out_format == DISK_FORMAT_RAW):
+            out_format == DISK_FORMAT_RAW or
+            out_format == DISK_FORMAT_VMDK):
             raise NotImplementedError("Cannot convert to disk format %s" %
                 output_format)
 
