When writing articles give them tips and hints and help them learn!
It can be tips on how to use a new product you've just launched or just a simple guide that explains what it's about.
I've noticed when you help people LEARN they will want more and get emotionally involved, which is where the sales process starts.
When you get to your sales page you should be listing all their concerns and answering them while providing a positive mental image of your product.
Think of it this way -
Articles - Logical (Learn)
Sales Page - Emotional (How can it help me)
Please don't overlook the power of this process, it can work wonders for your business! Have a great day/night and get writing.