Joe "Zonker" Brockmeier astutely declares that "We need a shared blog format". I couldn't agree more. In fact, I think his argument generalises to cover any conceivable category of software, although the problem is particularly acute in the area of web applications.
It is wonderful to be able to use, copy, modify, and redistribute free software. But having the freedom to do what you want with your data is just as important, and that requires open standards for data exchange between applications. Before selecting an application for a particular task, it is prudent to ask "What are my options if, years from now, I find another application that does much the same job, only better?" Unfortunately, in the case of existing Web Content Management Systems, the only answer is "You will have to do a lot of manual copying and pasting," which simply isn't good enough. A good deal of tedious standards work in this area is long overdue.