1.
Find a list of bloggers in your niche.
2.
Find their contact details. (Either their contact page, or their whois.)
3.
Send them a snail mail letter explaining your offer.
This seriously gets more high profile bloggers to review your products - because it cuts through the clutter. Its more work, but a lot more effective than email.
Don't use snail mail. Use email but with a) A superb subject line which lays out the differentiator of your product and b) a clear concise intro para which lays out the proposition in one easy glance.
That's all. If it's any good, we'll take a look at it. And yes I'm a journalist/blogger.
Shameless plug: If you're serious about snail mailing people, check out my latest project, SnailPad (http://www.snailpad.com). Pretty soon, you'll be able to upload a PDF and blast it to anyone you want, etc... my contact info is in my profile if you're interested in checking it out.