newspaper classified ad grabbing collection

I would like a small website hosted program (Script) written in cgi/perl (open to suggestion) to check 5 newspapers classified ads to see if a keyword selected has an classified ad posted, then it would email the results of those ads posted to me and my two sons. This would only run once a day. I would like this well documented so it would be easy to fix if the html is changed on the site or if a newspaper decision is changed. or if i change hosting site. login ad password protected with small admin to change keyword, email address's, the time script would run, thanks i'm open to ideas and sugestions