I've been looking forward to this. Everything seems to be moving along quite smoothly, so I think this is a good time as well. I hope you'll continue to write new programs and update current ones, but I think you should dedicate your time more toward reviews and other maintenance and let some other coders take the spotlight for a while.
So, I guess the real question is how to convince authors to join up. I imagine you'll want to target other freeware coders. You should have a clear outline of what services you plan to offer to authors--web hosting and their own forum for each program, I suppose. Plus, the benefit of having a like-minded community should also be enticing. Everyone here is pretty good about helping with betas and such. You might want to mention that banding together will help take the strain off their own webhosting bill. You should also try and work out exactly how the donation system is going to work with multiple authors and explain that to them.
I'll let you know if I come up with anything else.