A starting list of CRM resources

Certification: http://www.microsoft.com/learning/mcp/dynamics/default.mspx

E-Learning: https://dynamics.microsoftelearning.com/catalog/default.aspx  then select CRM 4.0 in the Product line

Course Manuals: https://mbs.microsoft.com/CMS/Templates/site/DLPP.aspx?NRMODE=Published&NRNODEGUID={2A456C8E-6563-43D2-8B6A-4B108D31159D}&NRORIGINALURL=/partnersource/communities/training/trainingmaterials/trainer&NRCACHEHINT=Guest&wa=wsignin1.0

Partnersource: http://crm.dynamics.com/crm_training_and_support/microsoft_crm_training/index.html

Resource Centre: http://rc.crm.dynamics.com/rc/regcont/en_us/onlinedefault.aspx

Reference: http://msdn.microsoft.com/en-us/library/cc160840.aspx

Some key CRM Forums are:

General: http://forums.microsoft.com/Dynamics/ShowForum.aspx?ForumID=487&SiteID=27

Development: http://forums.microsoft.com/Dynamics/ShowForum.aspx?ForumID=489&SiteID=27

Deployment: http://forums.microsoft.com/Dynamics/ShowForum.aspx?ForumID=488&SiteID=27

Blogs / Other Sites:

MS CRM Team http://blogs.msdn.com/crm/

Stunnware: http://blogs.msdn.com/crm/

Ronald Lemmen: http://www.ronaldlemmen.com/

CRMStuff: http://crmstuff.blogspot.com/  (some of this guys stuff is unsupported but other bits are good)

My own: http://robscrm.blogspot.com/

Umar Khan: http://umarkhan.wordpress.com/