How do I effectively join the Macs to the AD?

Hi. First, I must qualify that I am NOT a network individual. Some of the research I've done, I've managed to follow, but I don't have the technical know-how to fully understand it all. I desparately need help, please.
I work in a medium-sized environment, about 50 PCs and we employ Windows Server 2003. I've been charged with making 10 or so Macs work in Active Directory. Our Mac users constantly run into expiring netword passwords every 30 days (extending this is not an option because of the nature of the work).
How do I effectively join the Macs to the AD and allow changes to network passwords from the Mac?  So far, for every Mac users, I've used SMB to connect to server files/folders. But when the users' password expires, they are 1) not notified that their passwords are expiring and 2) are not able to change their passwords from their Macs when their passwords expires. I've tried binding my Mac to the AD and used a free software called ADMon to monitor my own expiring network password.  And that's proving useless because it's monitoring the local password for the Mac instead of the network password. 
Mac users are mostly on OS Lion, one Mac user on Snow Leopard.
I would really appreciate any help/advice you can provide.
Thanks!

AD is still broken with Lion as at 10.7.2. May want to read this thread to try the workarounds, mainly Page 5, while Apple sort it out.
https://discussions.apple.com/thread/3198558?start=60&tstart=0

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