Integration Engines - the Cloverleaf on the Information Highway

I was looking at eHealth career postings on the COACH website and found one at Telus for an Integration Health Business Consultant. What caught my attention was one of the Responsibilities: "Develop HL7 interfaces to integrate disparate health care applications using a variety of commercial integration engines such as: Oracle’s Java CAPS; e*Gate (SRE); Datagate; OpenESB; SOA Suite; Quovadx Cloverleaf; webMethods; IBM WebSphere; and Microsoft BizTalk." I had heard of Biztalk and knew it was a web service, probably using Service Oriented Architecture, but the rest of them were all new to me. This is a veritable flotilla of integration engines for disparate systems. It was only minutes later when I found myself searching for information about Cloverleaf ("The Swiss Army Knife for Data Conversions"), that I landed on the MDI Solutions website. Here I found a grouping of HL7 Integration Engines like I have never seen before. Their webpage on HL7 Integration Expertise includes many of these same integration engines.