Getting Linux computer integrated with Windows domain

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http://unix.stackexchange.com – I've tried to figure it out for several months, with no success. I have a Windows 2008R2 domain, and one Linux server (first it was Fedora 15, then 16, and now it's Centos 6.2). I am trying to make it member of the domain to the extent possible. Ideally, I would like to login and get authenticated against domain (say, login 'DOMAIN+john'). If not - at least be able to map directories through Samba with Windows credentials (better, map drives without specifying credentials, and just passing Windows credentials). I followed several articles, most closely this one; but still can't map the drive (HowTos)