Interesting. Jeff "Coding Horror" Atwood wrote a pan-Craigslist search a few years ago and they asked him to disable it.
"Service disabled by request of craigslist.org staff
Jeff,
Your search tool just appeared on our radar and while we appreciate your desire to extend our search functionality it goes against the basic intent of Craigslist to be a local tool. Also it's in direct violation of our Terms of Use, section 5:
Additionally, you agree not to: use automated means, including spiders, robots, crawlers, data mining tools, or the like to download data from the Service - exception is made for internet search engines (e.g. Google) and non-commercial public archives (e.g. archive.org) that comply with our robots.txt file;
Please disable your tool for public use. If you refuse to do so we'll be forced to block all the proxy servers that you're using.
"Service disabled by request of craigslist.org staff
Jeff,
Your search tool just appeared on our radar and while we appreciate your desire to extend our search functionality it goes against the basic intent of Craigslist to be a local tool. Also it's in direct violation of our Terms of Use, section 5:
Additionally, you agree not to: use automated means, including spiders, robots, crawlers, data mining tools, or the like to download data from the Service - exception is made for internet search engines (e.g. Google) and non-commercial public archives (e.g. archive.org) that comply with our robots.txt file;
Please disable your tool for public use. If you refuse to do so we'll be forced to block all the proxy servers that you're using.
-Bill
http://www.codinghorror.com/craigslist/
http://www.codinghorror.com/blog/archives/000252.html