Aside from confining it to zip code and metro area vs. address, I think there more data points that need to be added in order to get a more accurate picture of the job market. Just a suggestion, but:

1. Industry 2. Specific job title/function 3. Education level 3a. College(s) attended 4. Years experience 5. # of jobs held a different employers within the same industry 6. As a bonus, what type of discipline within the job function: enterprise, startup, consulting, freelance 7. Benefit level to include bonuses, healthcare, equipment/education reimbursement, travel

then sell job ads based on what the user inputs, because after all, isn't that we're looking for? Those admob things do nothing for me.