How you write the plan depends greatly on the intended audience. But any way you look at it the notion of writing the 50 page business plan is over.

Instead of writing this 50 page monstrosity your focus should be on the product/users.

Below is the best place I've found regarding business plans. The new business plan is short and practical and does not take you months to create.

http://www.thefailingpoint.com/2009/08/gettingstarted/write-...