Ideal Migration has significant capabilities for domain migration. Its characteristics (from product page):
A particularly important feature for a seamless migration
Aelita Domain Migration Wizard seems to have particular stengths in domain consolidation (from product page):
Altris has released AXMT, the Altris Migration Toolkit, which is a soft bundle of products and technologies designed to assist your migration to Windows 2000 or Windows XP. The Migration Toolkit provides you with a complete pre-migration inventory assessment, PC cloning/network configuration, software installation, personality restoration, and post-migration status report in a single tool. It is the only complete migration solution. Focus is workstation migration.
It is difficult to know how to evaluate such complex utilities. If you have had hands on experience with this utility or a similar product, please let me know .