SEO Checklist for eCommerce?

[Gordian]

Over the past week or so, my eCommerce site has experienced a large drop in organic traffic from Google.I have used analytics to determine that the pages that have seen the biggest losses in traffic are product pages.

I know there are so many seo checklists/site audit checklists out there recommending different things, but does anyone have a good checklist (or link to a good checklist) that would fit our situation best?

Thank you!

[SoleGraphics]

This is not an extensive list but here are a couple.

http://moz.com/blog/perfecting-onpage-optimization-for-ecommerce-websites

http://searchengineland.com/best-practices-in-e-commerce-seo-176921