Google Alerts, once the secret of savvy online marketers and social media experts, have become the de facto way for the masses to keep one eye always on the web. While there have been attempts to apply the instant alerts concept to Twitter (Twitter), we haven’t seen an application get the formula completely right yet. Perhaps we spoke to soon, as we just discovered Listiti, a new web-based application that promises to do one thing: send you email alerts whenever tweets from specific Twitter Lists match your specified query. - Marc Baumann