This may answer both this post and your next post.
SFDC- Overview of Object Relationships https://na1.salesforce.com/help/doc/user_ed.jsp?section=help&loc=help&target=overview_of_custom_object_relationships.htm&body=%2Fhelp%2Fdoc%2Fen%2Fhelp2.jsp&hash=topic-title
In short to create a related list of one object in your custom object you would need a master-detail relationship.
Unfortunatley, products is less agile than other objects and is not available as a master relationship for custom objects, possibly for any object other than Opportunities. You may consider creating the relationship to the Opportunity.
Saying "no way" is always a stretch for me. There is likely some API capabilities you could employ to interact with the data. That would be a question for someone with more knowledge than me.
I know there is not a simple way to tie products into a custom object.
SFDC- Overview of Object Relationships
https://na1.salesforce.com/help/doc/user_ed.jsp?section=help&loc=help&target=overview_of_custom_object_relationships.htm&body=%2Fhelp%2Fdoc%2Fen%2Fhelp2.jsp&hash=topic-title
In short to create a related list of one object in your custom object you would need a master-detail relationship.
Unfortunatley, products is less agile than other objects and is not available as a master relationship for custom objects, possibly for any object other than Opportunities. You may consider creating the relationship to the Opportunity.
Micaiah
I know there is not a simple way to tie products into a custom object.
Hope this helps.
Micaiah