http://www.theodells.org/theodells/blog/2010/09/sharepoint-2010-certification-preps/
http://www.amazon.co.uk/s/ref=nb_sb_noss?url=search-alias%3Dstripbooks&field-keywords=sharepoint+2010+customisation&rh=n%3A266239%2Ck%3Asharepoint+2010+customisation&ajr=0(Books available on Amazon)