There is a new Buzz Marketing company joining the blogosphere called LoudLaunch.  They help companies and websites get the buzz out about their product launces, websites, software or anything else.  They offer advertisers the ability to advertise on blogs around the globe and they pay bloggers to write reviews or sponsored articles and all articles must be disclosed.

LoudLaunch has a pricing plan that is based on the Pagerank of a blog.  The higher the Pagerank the higher the charge for the Advertiser on a blog and higher the payment for a blogger to write about it.

For bloggers concerning about losing a writing opportunity, you can reserve an article through their system to insure the funds will be there by the time you submit the article.

All in all I found the sign up process and blog approval turn around fairly quick taking a little less than a week for approval.  You can list multiple blogs and cover the same item on different blogs. 

One of the unique items about their service is that they provide a direct link to the original press release of their advertisers.  So this enables bloggers to write the reviews without bias, and the reader can still check out the primary source for the review to get additional perspective.