I am no SEO expert so I can't share anything inspirable (yet!), so I gather articles from experts...
I find this article quite good!
Cyrus Shepard from SEOMOZ published this article
Beating Google's Panda Update - 5 Deadly Content Sins
- Heavy Template Footprint
- Empty Content
- Overlapping and Redundant Articles
- High Ad Ratio
- Affiliate Links and Auto Generated Content
It seems that simply a product review site(like mine) is getting weaker in the eyes of Google, when the panda is clever now.