Team members: 
I've decided to re-commit to meeting with you weekly in One-on-Ones. I thought I would follow through last year, but I stumbled a bit. I believe in them, and I want to make them work throughout this year. At some point, I want us to look back and wonder how we did things before we had them. I want them to become like clockwork. The more we communicate, the more effective we're going to be. 
We're not going to get better by doing everything the way we always have. I think of One-on-Ones as a step forward in the way I manage, and how we communicate. I need your help to stay on track with this - if you see me sliding during the year, you have my permission to point it out and ask me to stick to my commitment to you and the team. If you feel I'm trying to decide between moving a meeting and canceling it (until next week), stick up for yourself and say, "hey, are we doing these every week or not?"  I'll get the message. 
Please let me know, within these windows, what might work for your schedule on a regular basis.... 
Respectfully, 

Manager