Fred Wilson wrote a couple interesting articles lately:
One of the mistakes I see entrepreneurs make is they move to business model before locking down strategy. The way I like to think about this is get the product right first, then lock down the strategy of the business, then figure out the business model.
From http://www.avc.com/a_vc/2013/06/product-strategy-business-model.html
Followed by:
Strategy takes what you want to achieve and develops a plan to get there. From strategy you can develop tactics and implement them.
For me, strategy is as much about what you are not going to do as what you are going to do.