robho - 9:05 pm on Nov 4, 2010 (gmt 0)
So you're selling the "trading name" collection (without business), and replacing it with a set of shorter names you mostly already have?
That 12 week period sounds good, makes sense for all parties.
Checklist-wise, one key thing is to update your addresses at all affiliate networks, forums, analytics etc - anything and everything where you may need a password reminder in the future, basically anything you've ever signed up for using the company domain.
I think it sounds like a good deal, if the money is enough for the work involved.