| Don't know about hooking it into particular sites, but building an an RSS feed is pretty easy if you're coding it yourself.
Either you're jobs page is just html, in which case you just need to learn how to write RSS (which is dead easy), or you've got a database of jobs, from which you have a script which generates the web page in html. In the latter case you just need a second script to generate the same info in RSS.
I did it for a couple of my sites (which run of a database) in a afternoon, and it works great (after a few minor glitches - embedding html in RSS is tricky/unnsupported/often necessary). My favourite trick is that if you ad a feed to the bookmarks bar in firefox it turns into a dynamicly changing pull down menu...
Ian | 
