go to textlinkads.com and you can buy links on people's sites (sorta auction thing) and payperpost.com let's you post an "opportunity" to get bloggers to blog about your product and link to it - you can specify what page rank you want.
You can see one I've done for payperpost on my blog
ixld.blogspot.com it's not a bad service.
I also did a video about it if you're interested.. go ahead and watch it here:
http://ixld.com/training/payperpost/payperpost.html
RR