It would be nice if there were a long, detailed Example Corp summary that went through the different functionality options for setting up and deploying IPA in an SMB environment and explains why certain options are available or why certain choices were made.

Something like....
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"Widget Co. has around 100 servers running Windows, RHEL and Solaris, they have asked you to design and build a solution using IPA so that they can use their Active Directory accounts to log on to all servers."

"Design:
You decide to implement a master IPA server with one replica, create a dns sub-domain of the AD domain for all *nix hosts ...  "

"Build:
You build a RHEL 6.2 host to be your master IPA server ....

# install IPA - (see section x.y.z)
yum .... "