Mike Manuel has published a must-read post for bloggers who are trying to get information, product etc. from companies. He offers a few simple tips that would make life easier for everyone involved.
As PR people, we are constantly being lambasted for our inefficient, badevilhorribleunethical ways by bloggers. While, unfortunately, there are some folks out there practicing bad PR, most of the people in the profession simply want to do a good job. But in order to do that job, we need some pretty basic information, provided by the blogger (or journalist for that matter), such as your name, purpose of your blog, what you want from the company and why, and some contact information.
While it would be nirvana to the PR person for you to explain your biases, your opinion of the company and other such items, we honestly don't actually expect you do to so. (We'll figure that out as we read your blog, etc. Sometimes we'll be burned, sometimes we won't, that is all the nature of the game.) But it isn't too much to ask for some information so we can get you the right data, line you up to talk to the right person, and so on. If you provide all that, and we screw up, shame on us (and I'm sure you'll let us and all your readers know!).