Okay so given that at least one mod looked at the topic and didn't lock it I figure I might as well ask away.
As I mentioned above, I'm in the process of developing a system similar to Mineshafter. How similar? I have no clue, as I haven't actually used it. But the goal of my system for end users is to be as simple as possible to use and update. For server managers you get the benefits of authentication (and the white/blacklists that go with it). Unlike Mineshafter, it does not rely in any way on Mojang's authentication system. This is mostly intended for the kind of people that currently use Offline servers.
Right now, I'm at the point where I need two things:
1) People willing to test
2) A server for them to test on
I've got me a basic setup locally, so I know it at least somewhat works, but I need people to try and think outside the box and find the little bugs I might not notice. Alas, I'm poor and have spent all my spare money on the core of the whole system, and can't afford any more hosting yet. Maybe someday, but not today. It doesn't need to be the greatest system, just enough to test the 16-32 people I want in the closed beta. At most. And most likely not at the same time.
I don't wanna seem spammy so I'm not going to direct link the site. For those that are interested send me a PM so I can point you to it. If enough people do or I get complaints that it's like suspicious or something I'll probably end up linking it here anyway.
However, if you have questions, go ahead and ask them here!