Okay, so I'll give you a baker's dozen of some really good stuff from the perspective of a Microsoft Dynamics CRM developer:
We recently published V4.0.6 of the SDK. Here are a few highlights with links to the online version:
A very popular technical article is the Developer Ramp up Kit. This is a collection of videos, presentations and labs that introduce you to developing with CRM.
Another popular technical article is an Intro to Plug-in Development.
Some favorite blog posts (there are many more!)
Are we having fun yet?
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