In the 21st century, there is no doubt that organizations are using information technologies (IT) to become more effective and efficient, consequently gaining competitive advantages. There are extensive researches on the organizational effectiveness of IT. However, there is lack of empirical study in how organizations are using IT. In this study, using exploratory study methodology, we investigate the usage and effectiveness of a variety of IT in organizations in different industries. Specifically, we focus on the extent of use and the effectiveness of traditional Information Systems (TIS), and two newly-recognized types of IS, E-Commerce (E-C) and Customer Relationship Management systems (CRM). We also examine the impact of industry types on the extensiveness and effectiveness of using specific IT.