Application vendors and SOA
This creates a tricky dynamic for Oracle and SAP, who ideally would like to expand their own footprint within customers at the expense of each other (and other vendors). If SOA actually works, then they will be enabling customers to easily switch out the bits of their applications that customers dislike in favor of others, which is not in their interest. Of course Oracle also sells a middleware stack, and now SAP has entered the fray with Netweaver. By doing so they hope to switch the ground: if someone is going to call up a non-SAP application from within SAP, then SAP would rather that they did it using Netweaver protocols than a rival stack, such as IBM Websphere. Indeed they would really prefer that people didn't do this at all, but instead just use more and more SAP modules. The same goes for Oracle. Hence these two application vendors need to be seen to be playing the game with regards to inter-operability, yet it is actually more in their own interest if this capability does not work properly. IBM, who does not sell applications, is in a much cleaner position here, since they can only benefit by having genuine application inter-operability via Websphere, whoever the application vendors are. IBM does not sell applications, so only has a vested interest in selling more middleware in this context (and of course the consulting to implement it).
Customers need to be very aware of the desire by the application vendors to lock them into their offerings through their middleware, and should question how genuine the commitment of application vendors to true inter-operability really is. Just as turkeys don't vote for Christmas, why would a dominant application vendor really want their application to be split into bite-sized pieces that could be each attacked by niche application vendors that would not have the reach to challenge their monolithic applications without this capability?
Of course Oracle and SAP cannot actually say this out loud. IBM (and other independent vendors like Tibco), however, should, and potentially this ought to give them an edge in the coming middleware wars.