It's just hallway testing with anyone in my immediate vicinity at the moment which provides nice instant feedback but looking into some sort of open beta when the time is right.

But in all seriousness, thats one bit I'm not going to kid myself can be done alone. You cannot user test your own code. There's just too much baggage & you never act like a normal user would.

As the developer you use exactly the right controls in exactly the right sequence & come away thinking the software is much more usable/stable than it is :)