In one of my latest articles I talked about a script from Xtravirt which can help you to have an offline documentation of all VMware Products available on your hard drive.
But today when I went to the vSphere 4.0 documentation page and I saw that there is also a possibility to download a bundle of PDFs from the Main Documentation Set.
Download PDF versions of all books in the main documentation set (in a zip file) here. You can also download and read the documentation one by one.Go and see yourself.
http://www.vladan.fr/vsphere-4-documentation-bundle-for-vsphere/
