Uuuh... I'm not sure if anybody has noticed, but robothacker hasn't been active on these forums for over a year now. That's not to say that we should let this thread die off, but there seems to be an awful load of people sending him nice messages that he probably won't be reading any time soon.
This guide has been included in the "The All-Inclusive UPDATED Guide to Texturing" page. Thanks robothacker for making this.
There is a link on that page that links to this page. Thanks for creating a guide to the mob texture layouts.
Here is the link to where in the texturing guide it's been added: Click Here (It's under the "Entity" spoiler, at the bottom of that spoiler)
NOTE(To the people that see this comment): I do know that robothacker hasn't been on for over a year, & I also know that some of the layouts are either outdated(as the layout might have changed), not included, or have small errors. I posted this comment as I do it for everything I link to in the "The All-Inclusive UPDATED Guide to Texturing" page. I added a link in the texturing guide page to this page, because while some of the layouts have small problems(like the ones I listed above), it's still for the most part accurate & still helpful in my opinion. That is the reason why I decided to add it in the texturing guide page.