idolw - 9:26 am on Feb 13, 2009 (gmt 0) Google definitely penalizes sites for buying links. @goodroi
I just made a pay per post campaign for one of my sites and it has been penalized in google in less than 10 days from the start.
Now the posts from the blogs that were SELLING links rank above my site for [mywebsitename].
I thought sellers were to be penalized too ;-)
Of course it is much better to concentrate on your own work as you know it will deliver more. But not everyone in the world is as smart as you. Guess google would have some checks before they penalize, e.g. how long the links were there, etc.
Google definitely penalizes sites for buying links.