If you are spending the time and resources to market to customers, your campaign should push them to your site.  Creating a specific entry page other than the home page is refered to as a Landing Page.  landing Pages can give you valuable information on the success of a marketing campaign. 

In the example below, you can see the top pages viewed which can help determine immediately, the success of your marketing efforts and what pages are of interest to customers.

Pages Viewed
Page Names Viewed Average size Entry Exit campaign.yoursite.com 43 16.38 KB 20 14 www.yoursite.com/home.html 35 23.17 KB   1 /services.phtml 28 21.24 KB 1 3 /testimonials.phtml 9 15.73 KB 2 3