I usually try to narrow my photo shoots down to about 30-40 images. I try not to show my clients more then that as I find it becomes overwhelming.
I cull my photos in a three step process.
Step One: This is the easy step delete all the obviously bad ones (eyes closed, weird expressions, flash did not fire, etc.) for a family or group portrait I might keep these in a separate folder in case I need them for fixes later.
Step 2: Weed out the duplicates. There will certainly be multiple shots of some poses and try to pick the ones I think are the best from each shot.
Step 3: The next day I will go through the remaining and try to pick my favorites from the files that are left. I wait a day to decide with fresh eyes if I still feel that it is a great shot otherwise I put it in the bin.

Sometimes for group shots It is difficult to get everyone in the group to look great in the same shot. For these instances I might have to do a little photoshop magic with a shot from the same pose to have everyone smiling and looking at the camera.

This is my system and I find it works for what I do from family portraits to actor headshots.

Ok, when I studied my Diploma in Children's Services, 'Formal' meant a planned group time for music and movement, and informal was more something that just happened.
2-3 year old children love music that is hands on, such as finger play rhymes, and music that they can do the actions to. Check out what the children are interested in and adapt music and movement to suit these interests. At a playgroup I used to help facilitate their were quite a few children interested in dinosaurs, so we sang dinosaur songs and moved around the room stomping our feet and roaring. We started with some 'settling' songs which were usually finger play songs like 'Open, Shut Them' and 'Incy Wincy Spider'.

For informal music, involve yourself with what the child is doing, and sing about it. If a child is building with blocks, sing 'Build them up, Build them up, build them higher' or 'We're going up'.

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