Product recommendations ("Users also bought...")
I have just released the first version of my integration module for RecommenderGhost, a free and hosted solution for personalized recommendations: http://drupal.org/project/recommenderghost
With recommendations you can offer "Users also viewed / bought" etc.
Setup is as easy as using the Google Analytics module: Activate the module, enter your credentials (you can get them for free at www.recommenderghost.com) and let the system collect some data. After 24hrs you get your first recommendations.
Please let me know what you think.