What are the best tools with which to prepare and organize for a 2003 to 2008R2 migration?

Beyond Event Logs, DCDIAG & RepAdmin /ShowRepl what are your mandatory and favorite tools for this job?  Single site with 6 DCs.

Thank you.
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AmitIT ArchitectCommented:
You already know tools or command you needed. Personally, I don't see any tool requirement for Domain upgrade. Max I use inbuilt command like repadmin /replsum. Still if you need a tool, you can check this one

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I agree, you already know what to use.

Check events for errors/warnings and make sure AD/DFS/FRS are replicating ok with events, dcdiag and replmon.

if all looks good you should be OK to look at the upgrade of your DCs, assuming you've checked all your software/hardware is compatible etc.
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