Metasearch Engine

The metasearch engine should be developed in PHP, Ruby on Rails, or Ajax or a combination of these languages. We are looking at creating a clone of the meta search engine [login to view URL] The highest priority will be that all searches are legal on the site meaning that we strictly adhere to the terms and conditions of the search engines that we use. Search Engines that we are familiar with that allow searching through an SDK or XML feed include [login to view URL], [login to view URL], [login to view URL] and Open Directory, however the metasearch engine does not need to be limited to this. We would like to have a search that uses all of these search engines and displays the best results for our visitors. Also included in the search engine must be a PPC ad system. This system must be similar to Google adsense but allow us to sell and manage our own PPC ads. The search engine must be turnkey. It can use open source existing programs as long as it does not violate their terms and conditions. It also must allow us to ad new search engines as they become available, if possible.