I was responsible for installing Samba3 domain with LDAP a few months ago and the most complete and comprehensible guide I found on the net was John H. Terpstra's guide, Samba3-by example. The guide contains real-world solutions for different organizational configurations, so I suggest you give it a chance. You can find it on the official Samba website. The servers I configured now serve both Windows and Linux clients - which as I understood is what you were looking for.
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I was responsible for installing Samba3 domain with LDAP a few months ago and the most complete and comprehensible guide I found on the net was John H. Terpstra's guide, Samba3-by example. The guide contains real-world solutions for different organizational configurations, so I suggest you give it a chance. You can find it on the official Samba website. The servers I configured now serve both Windows and Linux clients - which as I understood is what you were looking for.