It's not just about gentle discipline, but the earlier post reminded me I wanted to recommend the book Playful Parenting by Lawrence Cohen.
It's very AP in its approach. In fact, it goes into this great metaphor on page 43 of the hardbook edition about "filling and refilling a cup," how parents should be a "child's reservoir, a place to start from and return to, in between explorations. The child's need for attachment with them is like a cup that emptied by being hungry, tired, lonely or hurt. The cup is refilled by being loved, fed, comforted, and nurtured."
The metaphor goes on for a while, I think quite beautifully. At the end of that section he says: "even the most loved and well-cared-for child seems to have a bottomless need for love. His or her cup may be intact, but it still needs almost constant refilling. Therefore, the most important thing we have to offer to our children is the ability to make them feel loved, respected, wanted, and welcome."
Anyway, chapter 14 is specifically about discipline and why he doesn't like time-outs. I don't have a child that age, so I'm in no position whatsoever to comment on that subject, but I thought others would find the book interesting, too.
Re: s/o gentle disciple: book recommendation
Playful Parenting has been on my bookshelf since DD was 18 months, but I've never gotten around to reading it since we felt like we had things under control. Now that she's 2 1/2 it is the next book I'll be reading!
I think this is a great goal, and I felt the same way when DD was 18 months. But let's talk again when your DC is approaching 3. :-)