Other than the manuals (which you get on the CD), there's various white papers which you can find on here.
Also, there's 4 (I believe) training manuals, which you get as you attend a training course, which is quite a bit of documentation to get you started.
LANDesk EMEA Technical Lead.
Another thing that helped me was googling "Introduction to ITIL", and Introduction to ITIL processes. You can also search for an ITIL Glossary.
I found that once I had somewhat of an understanding of the ITIL Terminology and Best Practices Approach, the LANDesk implementation and Documentation made much more sense.