Check out this article from MSDynamicsWorld.com where Mariano Gomez, the CEO of Maximum Global Business, LLC provides some really good advice on how to approach integrating Dynamics CRM to Dynamics GP. One of his key nuggets of wisdom is to choose the best tool for the job; in the case of the customer he references, that happened to be Scribe Insight for its flexibility and scalability. It was also noteworthy that this customer already owns eConnect, Integration Manager, and Web Services.
Aside from the selection of the tool, the suggestions about finding a good partner, knowing your business process, and using subject matter experts are spot on.
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