I am not looking for your Intellectual Property or anything, I am just curious what sort of problems people who have more experience than me have found in their failures and successes.
I mean, would it be something that scrapes other site's cookies (is that even "legal"?) looking for previous shopping information?
what format? Web-based User Interface vs a program you download?
A program that goes through the day's top google searches and trends them with other searches to look for emerging search terms and patterns?