Suggestion: Related Products link
Since a lot of my products will be similar (same manufacturer, etc.), it would be a great idea to have other products, related to them, showcased on one product page as links or something. Similar to how Vbulletin has a "similar threads" option for members to browse through other threads that are similar in topic. Or if your products are books, you should have links or a separate window displaying OTHER books by the same author or publication.
The keyword feature is too limited.