Custom Key Value fields in a content type I am searching for functionality similar to the Double Field module only for Drupal 6.

Does anyone know of a suitable module or if not, could you outline an approach to creating this functionality?

Thanks, apologies if this is poorly explained.
I realise I'm answering my own question here but I've done some digging and come across the TableField module. 

Does anyone have any experience with this? 

It appears to do something along the lines of DoubleField.