From the Engineering team:
The importer is coded such that the "Account Type" column should have integer codes that correspond to the Account Types in the database. For example: Partner in my database corresponds to the id 11 in the database.
So when I import with 11 as the value for "Type" column in the database, it gets imported as Partner. Also in the code there was a bug where-in the contact type value was being referenced instead of Account type while processing Account Type information. I had to fix this first to get the above working. But the working itself now needs to be changed to allow the user to put in type names instead of type ids.
2 Issues and I'll fix both of these :).
-Tom