I've been wondering about this, too. I was thinking if we could all work together to update the Slowtwitch stack and reach database, we could have something really useful.
When it comes down to it, having a centralized list of the measurements of frames and other components would be good, along with a few tools to put together a configuration based on those (i.e., to get this pad stack and reach with this frame and these handlebars, use this stem with this many spacers, etc.). Maybe take the open source/wiki/cloud approach to it?
I would be willing to help out. I'm an IT Business Analyst by day, and although my time is pretty limited these days, could probably help out with database design, implementation, screen design, and data entry. I already have been starting to gather my own information on frames, but it's a exercise in futility by myself, and only benefits me. The key to making it valuable would be to allow others to add new equipment, rather than having one person stuck with that task. If we can kind of form an alliance, we could have something good - perhaps a website and maybe even a mobile app. I do know some technology people who can help, although they would be less willing to work for free.
Travis Rassat Vector Cycle Works
BikeFit Instructor | FMS | F.I.S.T. | IBFI Toughman Triathlon Series Ambassador