TalentSeekr from EnticeLabs got some press this month on BusinessWeek.com:
The TalentSeekr service sells a new spin on the want ad. You give them the skill set and location of your open position, they place ads on web pages they claim are most likely to be read by your ideal candidates, actively job hunting or not. TalentSeekr also adjusts the types of ads and the mix of sites on the fly to maximize results. And TalentSeekr produces customized landing pages to entice the right candidates to apply.