For Drupal Commerce users, please try http://drupal.org/project/commerce_rec

This module provides two default views:

1. Users who ordered this product also ordered.
2. Personal recommendation based on your previous purchase.

You can modify the default Views to meet your purpose.

The personalized recommendation view requires to read the user's purchasing history. If a user hasn't made any orders, it displays nothing. In that case, you might consider using the Browsing History Recommender to make recommendations based on users products viewing history.

Contributed as part of my Google Summer of Code'11 project and Google Summer of Code'09 project

Alternative module:
http://drupal.org/project/easyrec_for_ubercart