Just a few that have crossed my path recently…
1) Postdoctoral Research Opportunity: Geophysical Modeling of Asteroid Interiors
2) Postdoctoral Position in Organic Cosmochemistry at the Carnegie Institution of Washington
http://astrobiology.nasa.gov/nai/newsletter/display/2010-09-13#595 (NAI Newsletter)
Added by editor: 3) Postdoctoral position to work on MESSENGER work – see comments for details.