Think of a new product that would perfectly complement your existing one while adding value to the brand.
It could be a smart social-device that is able to share information with other products or connect customers with each other.
Launching a complimentary product will make the brand newsworthy again.
When you advertise the new product, you naturally advertise the brand.
It also establishes credibility in the industry and attracts customers to the website.
If a full investment in a new product is too daunting, consider launching it with just a limited quantity in a small test market.