VMware really did an outstanding job with the availability of vSphere 5 information at their new vSphere 5 Documentation Center. It offers a wide range of documents in searchable HTML format but also offers all guides in PFD, ePub and mobi format. It even has a link to one downloadable zip file with all the vSphere 5 PDFs you need.
Archive of all PDFs in this list [zip]
vSphere Basics [pdf | epub | mobi]
vSphere Installation and Setup [pdf | epub | mobi]
vSphere Upgrade [pdf | epub | mobi]
vSphere vCenter Server and Host Management [pdf | epub | mobi]
vSphere Virtual Machine Administration [pdf | epub| mobi]
vSphere Host Profiles [pdf | epub | mobi]
vSphere Networking [pdf | epub | mobi]
vSphere Storage [pdf | epub | mobi]
vSphere Security [pdf | epub | mobi]
vSphere Resource Management [pdf | epub | mobi]
vSphere Availability [pdf | epub | mobi]
vSphere Monitoring and Performance [pdf | epub| mobi]
vSphere Troubleshooting [pdf | epub | mobi]
vSphere Examples and Scenarios [pdf | epub | mobi]
