Database, Web Service, and Data Crawling Development Project

Hi We are looking to develop an iphone application for our business however we need the design and development of the database and web service before we can proceed with the iPhone UI. What we need is the following - Database to store all the information - this database will need to have internal rules to perform data validation before publishing the data into production - Web Service to perform data Crawling / data scrapping - Websites can and will be provided. Crawling needs to capture the Header-Name, Address, Contact details and Description/Body Text - Web Service which will serve as a content aggregator and provide data updates to the iPhone app, from a HTTP request from iPhone client - Web Panel / Admin Interface - this area is for admins to login to manage the database (brand management, category management, etc). Prefer database is coded in Open Source language, O/S Unix/Linux. Please refer to attachment for further information. All developers will be required to sign an NDA before further disclosure of information. Regards one28bit