I noticed a new trend during the last VON (Voice-On-the-Net) show where my company exhibited - now, the press list includes bloggers as well as traditional magazine editors. I have also noticed that most of the traditional magazine editors have online blogs specific to their area of expertise.
During these economic times, advertising budgets for most companies are slim.
I suggest searching to find the blogs specific to your field that are most likely to reach your target customers, then adding comments whenever and whereever possible.
This will help position you as an "expert", and will get your company's name in the press without a high price tag.
Better yet, set up your own blog that focuses on industry trends and happenings.
When your potential customers see that you really know and understand their area of concern, they will be more likely to do business with you.