What is the Difference Between Gram Positive and Gram Negative Bacteria?

There are several difference between Gram positive and Gram bacteria:

Gram Positive Bacteria	Gram Negative Bacteria
Peptidoglycan layer (thick)	Peptodoglycan layer (thin)
Polysaccharides (thin)	Lipopolysaccharides (thick)
Teichoic Acid present	Absent
Ribitol present	Absent
Absent	Porins
Glycolipids	Phospholipids