I think there is lots of crazy ideas that need to be built, the next job I find I will probably just rely on tools like these for the fun of it.

I've got a few that I will chime in later with. A simple one for now, is put a couple buttons next to the job listings in your UI.

Generate cover letter - Make a cover letter based off your resume and the job description

Generate tailored resume - Create a permutation of your resume to promote things relevant to that job description