Craigslist ad search

I need a small pc program that can go online, read craigslist ads and provide me a database of ads that meet certain requirements. I want to be able to determine what city to look in (or state, or all). I would like to be able to specify what categories in craigslist to look in (jobs, services, etc). I would like the software to provide a dump a list to a database file of all ads that meet the specified criteria (for example "is it ok to contact this post with services"). Let me know if you need more information.