I think this is just screaming for a business opportunity based on aggregating the postings on all these sites and building a single interface to it.

I've done just that at http://jobs.plasis.co.uk - it currently only supports 9 of the sites but I'm adding more all the time.

Nice! You're on stumbleupon now, too.

My that sounds like an idea. Then you can use Canvas or something to build a visual representation of the data.