This lady makes her cookies 3/8", and she has lots of pics for you to check out as well:
http://cookiecrazie.blogspot.com/
She'll answer questions you leave in the comments -- I asked about baking time once earlier and I believe she said around 18 minutes per tray. But of course that also depends on the size of cookie you are making, your oven, etc., and you often just have to keep a close watch on them.
I baked a batch yesterday rolled to 3/8" and they were perfect. I noticed that they looked much better if my dough was ice cold when I cut them. I baked mine at 350 for about 13 minutes and was thrilled with them- like you I had seen beautiful pics of the nice thick ones and wanted to give it a shot. I'll never bake a skinny cookie again!! 
I roll out thick at about 3/8" too. I just bake longer at 350, approx 16-18 min, but they are well-chilled in the freezer.
This lady makes her cookies 3/8", and she has lots of pics for you to check out as well:
http://cookiecrazie.blogspot.com/
She'll answer questions you leave in the comments -- I asked about baking time once earlier and I believe she said around 18 minutes per tray. But of course that also depends on the size of cookie you are making, your oven, etc., and you often just have to keep a close watch on them.
Hey that's a CC member...psneed5! I would recognize those turkey cookies anywhere! http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1520682
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