Epocrates has a new program called pocrates Dx, based on the 5MCC platform. It is completely integrated with Epocrates Rx Pro when you have both on your palm. They have also introduced a Lab reference program, again completely integrated.
I think that Epocrates is stealing the market. With regularly updated 5MCC entries, full drug and lab integration, I hardly ever use my palm uptodate anymore.
They affer everything (Rx, Dx, Labs, ID, and MedMath) as a subscription package called "Epocrates Essentials." I think it goes for about $139/year, and for me has been worth every penny.