I have a new creation to share with you: http://bluelytics.com.ar
This website is an interface to scraped data from La Nacion, Ambito Financiero and DolarBlue.net, those are all sites that have estimated values for the black market Argentine Peso to Dollar and viceversa conversion. The main objective is to show potential users the discrepancy between sources so they can do better decisions about their money, having all available information at once.
I used cron for scheduling, CasperJS for scraping, Python for image recognition and CasperJS scripting management, and Python+Django with PostgreSQL for the website. The source is available at my github :) (bluescraper and bluelytics)