Puppet Docs
http://docs.puppetlabs.com/puppet/
Type References
http://docs.puppetlabs.com/references/latest/type.html
Learning Puppet
http://docs.puppetlabs.com/learning/
RAL - Resource Abstraction Layer
http://docs.puppetlabs.com/learning/ral.html
IDE for developing puppet modules and manifests (Eclipse based)
http://cloudsmith.github.io/geppetto/
Language Summary
http://docs.puppetlabs.com/puppet/2.7/reference/lang_summary.html
Learning VM - OVF (VirtualBox)
http://info.puppetlabs.com/LVM-OVF-Confirmation.html
http://info.puppetlabs.com/download-learning-puppet-VM.html
Cheat Sheets
http://docs.puppetlabs.com/puppet_core_types_cheatsheet.pdf
http://docs.puppetlabs.com/module_cheat_sheet.pdf
http://puppetlabs.com/misc/webinars/
Download Options
http://puppetlabs.com/misc/download-options/
Books
Apress - Pro Puppet