product attribute as a textfield and not dropdown menn or radio button

[dwsnow]

How do I get my product attribute to be a text field and not a drop down menu or radio button?
I would like my customers to be able to enter arbitrary text specific to a product while placing an order.
Thanks in advance.

[sff]

There used to be a module (freitextattribute) in the shop - it disapeared somehow...