I have just installed the babelfish and 2.0 modules and when I try to do anything with them, I get this error:

A critical error has occurred.
'LocalesDropDownList' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value

I have tried uninstalling and reinstalling and deleting modules and reinserting them, no change.

What am I doing wrong.

I finally figured it out - your last module didn't give me this error so I never knew I needed to enable languages inorder for them to appear in the default language screen.  It was just a matter of checking a box.  Hope you had a good vacation.