I am also looking for a multiple shipping address modification. Module should be compatible with v1.3 and later. I would like to have a drop down list box on each individual product page that says "Ship to Me" or "Ship to (x)" that lists all of the addresses in the customer's address book. During the checkout process, items will be grouped by shipping address (include a header row for each shipping address). I would also like to see this detailed in the email to the customer and the admin.
As mentioned before, a similar osCommerce contribution was developed which may be of use:
[url removed, login to view],2548/category,2/search,Multiple+shipping+address
Payment would be made through GAF once I've installed the module and know that it works. Thanks and please let me know if you have any questions.