Why Won't Johnny Run Linux? - Problems with Microsoft Integration
Single Signon

Can't log in using Windows username/password

Or maybe you can, but it requires a PhD in Sambaology

There's a nice recipe at weblog.bignerdranch.com,
but it's about 20 steps long, many of which 
have you edit config files with vi.

The OS/X instructions there are about half as long,
and involve no manual editing of config files