C.T.
We transitioned out daughter from our bed to a crib in her own room at 7 months. I started off putting her in there while I was folding laundry etc just so she could hang out in there and not have to go to sleep. Then I put her in there for naps and then finally bed. We still have out guest bed in her room so some nights if she was having a tough time I would sleep in there with her and put her in bed with me. I still nurse her before I put her down at 11 months and she is drowsy rather than asleep when I put her down. She has always done well at being put down and going to sleep however recently once she became more active she did not want to be left alone and go to sleep. I tried the letting her cry a bit and then going in and leaving again. Didn't work. I read the Healthy Child Healthy Sleep habits book someone referred to. The info on sleep patterns is very good but the advice to let a baby 4 months and older cry for an hour at nap time and indefinitely at bedtime was something I could not subscribe to. I did leave her one night walk out shut the door and leave her to it. She cried for 40 mins. Not a screaming I'm dying cry, more of a I don't want to be in here and I don't want to go to sleep cry.
I have found some middle ground which is I nurse her, put her in the crib and then sit on the floor with my back up against the crib. She cries and tosses and turns and puts her hand on my shoulder and I touch her hand back and I talk to her quietly telling her that i know she is upset but that it is bedtime and time to go to sleep. If she plays with my hair etc too much I move away so she can't touch me. The longest this has taken me is 30mins the first night about 15mins the next night with barely any crying. Last night she didn't cry and was asleep in 10mins and tonight I put her down walked out and haven't heard from her yet. I have also started putting her down a little earlier, she was going down at 7.30pm this week I have got her down at 7pm and that has also helped.
This is a great resource http://www.handinhandparenting.org/
they are in Palo Alto and their website has some great articles about crying and why babies cry and how to respect their need to cry but to hear them and to listen rather than shut them in a room and walk out.
Hope this helps. Be patient (which is hard at times I know!).
C.