I've been programming in Unity3D exclusively for about 3-4 years now, although I would absolutely still consider myself an amateur. I currently work alone on all of my projects, and even though I've tried working with a group, they would always fall through due to a lack of coordination, motivation, and/or direction.
However, if you would like to work together then let me know as I have wanted to work on something a bit more complex and learn something new :) Do keep in mind though that I would not feel comfortable in a large group, and prefer particularly small teams.
Nothing at the moment, busy with other stuff while simultaneously trying to find the motivation to work on something. I've been planning things in the meantime, though.