"There have been some recent changes that Google have made with regard to sponsored postings.
Google has primarily targeted PayPerPost member blogs and reduced their Page ranks across the board. Although this WILL NOT REDUCE your rankings or readership, your blog will receive more campaign offers if it has a higher page rank. To prevent any future loss of page rank due to this issue you can take the following steps:
1. Remove all sponsored post tags on each of your posts. Google can follow these tags to determine if you are being paid for posts.
2. Remove any PayPerPost tags on your posts for "hire me" and "review me". Any general affiliate banners are fine to keep."
So for you guys out there, better start making the changes