PayPerPost is a new guy on the block that pays people to blog. The difference here is that they are picking a specific product and blogging about it and many feel that this is a bad thing for all bloggers.
The integrity of it is in question do to the fact that people aren’t so much blogging, as they are supposed to be leaving a favorable review on a product they have “tested”.
Who knows what this will do to blogging in the future but as we see new things happen every few months. You just have to try and keep up with it.