IBM > RedBooks > Linux
http://publib-b.boulder.ibm.com/redbooks.nsf/portals/Linux

IBM > RedPapers > Linux
http://publib-b.boulder.ibm.com/Redbooks.nsf/Redpapers?SearchView&Query=linux&SearchMax=4999

IBM > DeveloperWorks > Linux > Tutorials
http://www-106.ibm.com/developerworks/views/linux/tutorials.jsp

Create Your Own documentation using IBM > Toot-O-Matic which uses an XSLT stylesheet and XSLT extension functions to create HTML pages, ZIP, JPEG and PDFs.
http://www-106.ibm.com/developerworks/xml/edu/x-dw-toottut-i.html
ftp://www6.software.ibm.com/software/developer/library/tootdownloads/

DVDs
http://www.dvdrw.com/
http://www.videohelp.com/