Here are some links I think are valuable and give out at VMware ICM courses

vSphere

Memory and performance

http://www.vmware.com/files/pdf/techpaper/VMW_vSphere41_cpu_schedule_ESX.pdf

Resource Pooles and Resource Management

http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-50-resource-management-guide.pdf

http://communities.vmware.com/docs/DOC-17417

http://wahlnetwork.com/2012/02/01/understanding-resource-pools-in-vmware-vsphere/

vSphere HA & DRS
http://www.yellow-bricks.com/vmware-high-availability-deepdiv/

http://www.yellow-bricks.com/drs-deepdive/

http://communities.vmware.com/docs/DOC-18164

vSphere vMotion

http://www.vmware.com/files/pdf/vmotion-perf-vsphere5.pdf

Performance
http://www.yellow-bricks.com/esxtop/

http://www.vmware.com/pdf/Perf_Best_Practices_vSphere5.0.pdf

http://www.vmware.com/resources/techresources/10131

http://slideshare.net/esloof/vmware-vsphere-advanced-troubleshooting

http://communities.vmware.com/docs/DOC-3961

Storage
Netapp BP
http://virtualstorageguy.com/2011/12/13/netapp-releases-storage-best-practices-for-vmware-vsphere-5/

Storage DRS

http://www.vmware.com/files/pdf/techpaper/vsphere-storage-drs-interoperability.pdf

Tools
http://labs.vmware.com/flings

Autolab

Free VMware tools
http://vsphere-land.com/vinfo/free-tools

Documentation & referens
http://www.vreference.com/

http://www.vmware.com/support/pubs/vsphere-esxi-vcenter-server-pubs.html

http://blog.mwpreston.net/wp-content/uploads/2012/02/OMG-Study-Guide.pdf

Mythbusters goes virtual
http://communities.quest.com/community/foglight/vfoglight/blog/2011/11/18/mythbusting-goes-virtual–webcast-playback

PowerCLI
PowerCLI user guide
http://www.vmware.com/support/developer/PowerCLI/PowerCLI501/doc/vsph_powercli_usg501.pdf

http://velemental.com/2012/01/01/optimizing-the-execution-of-powershell-and-powercli/

powerCLI ref
http://www.vmware.com/support/developer/PowerCLI/PowerCLI501/html/index.html

vCheck
http://www.virtu-al.net/featured-scripts/vcheck/

Books
http://www.bokus.com/bok/9781463658137/vmware-vsphere-5-clustering-technical-deepdive/

http://www.bokus.com/bok/9780470890806/mastering-vmware-vsphere-5/