More / Better Product Photos
Flash Zoom with Different Angles
Include Manufacturer info
List benefits not just features
Show product measurements or weight
Make "Add to Cart" Impossible to miss
Allow customer generated product reviews
Ask a Question Link
Show Related (cross sell items)
Show Related upsell items
Show add on items
Include possible search query terms in the title and meta tags
Foreign Currency converter
Add a Wishlist
Email Me When It's Re-stocked Button
Email Me Before It Sells Out Button
Email Me When it Goes on Sale
Email Me When Product Like this are Added
Social Bookmarking Links
Bread crumb navigation
Upload Product pictures
Audio Testimonials
Video Testimonials
Back Button to Product Category Page
Browser Bookmark Button
RSS Product Feed