Very very dry topic :)
In my last post, I spoke about working with other GTD developers to build an interoperability format. That'll mean that you'll be able to take your data with you when you move between applications/operating systems/websites.
I've created a Google Group and now there is a bunch of us GTD application developers discussing the issues. No promises on when/where, but it's quite refreshing to have a bunch of us working together for a common purpose and with all of our users able to benefit!
So worry not, it will go somewhere. Frankly, I think it would be hard to stop...I'd better keep up! I also suspect this won't be the last useful thing to come out of the collaboration.