Enterprise Application Integration (EAI) is the technology that allows businesses to link their various applications and systems to each other and to e-Commerce applications.

With EAI you can link together one or more ERP systems to product data management (PDM) packages, online web portals, trading exchanges, EDI hubs, financial systems etc.

webMethods - http://www.webmethods.com/

BEA Systems - http://www.bea.com/

IT Toolbox EAI Knowledge Base - http://eai.ittoolbox.com/

Business Integration Journal Online - http://www.bijonline.com/

Enterprise Application Integration Books