Inspired to go looking after Dave linked to the perl.org RSS feeds of their job listings, I just found that jobmart.com has feeds of each of their job databases:

• Mac OS X: http://macosx.jobmart.com/Resumes/JobOpennings/RssFeed
• Linux: http://linux.jobmart.com/Resumes/JobOpennings/RssFeed
• Python, Plone, Zope: http://python.jobmart.com/Resumes/JobOpennings/RssFeed
• Wireless: http://wireless.jobmart.com/Resumes/JobOpennings/RssFeed

Very cool! I've subscribed to several.