[ggchappell]

Getting there. DNF took 15 years. Perl 6 will surpass that if we don't get a real release in 2015.

But the real champions for delayed development are LaTeX 3 at something like 20 years & counting, and the GNU Hurd at 24 years & counting.

[vezzy-fnord]

The most protracted piece of vaporware in history is actually Project Xanadu, at a whopping 54 years.

[gpvos]

Is someone actually still working on that?

[vezzy-fnord]

Yes. In fact, OpenXanadu was unveiled this year: http://xanadu.com/xanademos/MoeJusteOrigins.html

That said, it's mostly just a web reimplementation of the incomplete 1998 Udanax client.