Migrating from Exchange 2007 to 2010, any general advice from the trenches?

Sure there are generic guides out there, but was just wondering if any actual day to day admins had any advice, tips, or gotchas to look out for, in order to, in the the safest and most effective way, migrate from our current single 2007 exchange virtual server to a new 2010 virtual server.  Helpful online resources, personal insights, or manuals appreciated.  Thanks in advance, folks.