Create content types in VS

http://msdn.microsoft.com/en-us/library/gg295290%28v=office.14%29.aspx
http://msdn.microsoft.com/en-us/library/ff648024.aspx
http://leedale.wordpress.com/2009/01/20/creating-an-enhanced-rich-text-field-in-your-sharepoint-content-types/
http://stackoverflow.com/questions/2172714/deploying-content-type-with-publishing-html-field-by-feature-saving-content-not
http://sharepoint-ss.blogspot.co.uk/?_sm_au_=iVVWSNbsjQF5kPbs
http://harishnagalapur.wordpress.com/

Add-in to create page layout from custom content type
http://visualstudiogallery.msdn.microsoft.com/990bd0c8-a55b-4643-a35d-88136594c3d9/

referenced here
 http://rburgundy.wordpress.com/2010/05/21/sharepoint-2010-create-page-layout-based-on-a-custom-content-type-in-visual-studio-2010/

First four characters of the field name must be alphabets
http://www.dannyhansen.nl/sharepoint/sharepoint-2010/first-character-sharepoint-2010-internal-field-name-replaced-with-its-hexadecimal-code

Creating content types programetically
http://sharepointdragons.com/2012/04/10/content-type-galore/

Script to change multiline textbox mode
http://chweber.wordpress.com/tag/sharepoint-2010/

SharePoint OOTB field types
http://sharpointpractice.blogspot.co.uk/2011/08/sharepoint-field-types-elementsxml.html?_sm_au_=iVVpRKFRLF7qMSnQ

Fieldref element in the content type
http://msdn.microsoft.com/en-us/library/aa543225.aspx