I'll second CountZero's suggestion of just recording the last check time instead of storing all seen messages... if you're going to do this yourself.

You may want to take a look at Google alerts first to see whether that does what you want. Your description of what you're doing sounds pretty close to what you'd get by setting an alert on 'site: portland.craigslist.org <search terms>'.

In reply to Re: Is there a better way to do this? I need to keep track of results... by dsheroh
in thread Is there a better way to do this? I need to keep track of results... by walkingthecow

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