Mine for sure is @Mrs Jacks' post about MSPI. It came right as I was struggling with LO and was the catalyst to me cutting dairy and soy which lead to me have a MUCH happier baby. Without HB and Mrs Jacks I never would have known about this! 

http://www.hellobee.com/2012/06/04/beyond-colic-milksoy-protein-intolerance/