Most astronomy jobs are advertised on the AAS Job Register which i updated monthly. For those who cannot wait, this site trawls the register and allows you to see recently subitted jobs which do not yet appear on the web-pages.
This UK site may be useful for general academic jobs including astronomy.
Berkeley have a similar page which summarises a lot of the available fellowships.
It is also useful to look at different astro groups' webpages as not all jobs appear on the AAS site.
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Information
Main Web Users Groups Index Search Changes Notifications Statistics Preferences
Webs Main Sandbox TWiki Zen