I've been asked this question at least a dozen times this week (which is fab!).  Partners and customers may download customer-ready collateral by following this 3 step guide, using SharePoint as an example:

1) Visit Office Online at http://office.microsoft.com/

2) Click Products: http://office.microsoft.com/en-us/products/

3) Choose your program/server/solution/technology of your choice, such as "SharePoint Server": http://office.microsoft.com/en-us/sharepointserver...

Scroll down and there's a little box "Explore the Details" with:

In-depth information about SharePoint Server 2007

This is availalble for almost every product in the Office system.

Two other fabulous resources on the Partner portal also include:

1) Solution Showcase Scenarios (by industry and department): https://partner.microsoft.com/uk/productssolutions...

2) Gear Up Sales Toolkit, which is a product handbook of the full Microsoft portfolio: https://partner.microsoft.com/UK/40033104?PS=95000...