Big players
AT&T Developer Program | devCentral Home
note the URL on the Web 2.0 Expo site is wrong, this is the correct URL by Apr 9
IBM Collaboration Software (Lotus) delivers business collaboration software and solutions. Empower people inside and outside your organization to connect, collaborate, and innovate. Create a smarter workforce. Deliver exceptional customer experiences. Transform your core business processes to become more competitive and drive real business results.