Here's a new Redbook that provides a system administrator view of the technical differences and methods necessary to complete a successful migration from Solaris to AIX 5L based systems. It also appears to be a good general AIX admin reference.
Solaris to AIX Migration: A Guide for System Administratorshttp
://www.redbooks.ibm.com/abstracts/sg247245.html
Other Redbooks in this category include
AIX Reference for Solaris Administrators
http://www.redbooks.ibm.com/abstracts/sg246584.html?Open
AIX 5L Reference for HP-UX System Administrators
http://www.redbooks.ibm.com/abstracts/sg246767.html?Open
Solaris to Linux Migration: A Guide for System Administrators
http://www.redbooks.ibm.com/abstracts/sg247186.html?Open
Guide to porting from Solaris to Linux on POWER
(See "Resources" at bottom of page for other useful links)
http://www-128.ibm.com/developerworks/linux/library/l-pow-portsolaris/
Deloperworks: IBM articles, tutorials, and technical resources for AIX and UNIX users
http://www-128.ibm.com/developerworks/aix
Migrating Solaris Applications to AIX
http://www-03.ibm.com/servers/enable/site/peducation/wp/2afa/solaris_aix.pdf
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administration