Apart from seeding press releases and product demos, another way to tap bloggers and online publishers for help would be to engage them in a partnership to run consumer surveys within their niche if influence.
For instance, you can discourse with three technology bloggers to run a series of surveys on consumer insight about mobile phones and in turn give out a good enough prize to a random draw of survey respondents. It gives you insight on the different sub niches of each blogger and you also get a more reliable and diverse sampling of the data.
The important thing here is that survey respondents should be able to immediately WANT the prize, so if you’re raffling off a 10USD coupon for Amazon, you may have to think bigger.