FallenAngel
Headphoneus Supremus
I've been depressed about this trend as well. Some of my favorite board designers/providers are getting out of the space, including Geek at Classic Valve and Shannon at DIYTube.com. As you've mentioned, Millett is doing most of his work with TTVJ, which makes sense, I'm sure he's much better reimbursed from that activity than providing boards and answering support questions for free. Hagerman Audio has also gone to turn-key products. I think what it really boils down to is offering DIY boards isn't terribly profitable, it's more of a community service. You can't really blame anyone for turning their priorities to something more monetarily rewarding, they may have family expenses or other financial obligations.
We still have some great kit and PCB options from Beezar, Dynakitparts, Tubes4HiFi/Bob Latino, Bottlehead, AMB, Kevin Gilmore, GlassJar Audio, and Decware (and more I'm sure I'm forgetting). I think Beezar and Bottlehead have discovered a good business model where some of the development cost is "baked in" to the kit cost. I don't think anyone would get rich from this type of thing, as DIYers tend to know the value of parts and would just migrate to other designs if the cost became prohibitive.
I've moved my DIY activities to a blog where I have a bit more control of things, you may have stumbled on it.
This is a good spot for headphone amp DIY discussions:
http://www.diyaudio.com/forums/headphone-systems/
I know exactly how you feel and think the same. It's frustrating to think of the current state of affairs while remembering so many designs and PCBs being developed for the community, not for sale.
I don't mean to say anything negative towards the amazing people that support this community like AMB, GlassJarAudio, Beezar, etc. It's awesome!
What about new designs though? I know the "other forum" has some things and there is development being done elsewhere, but I just want to bring it back HERE!