dot-inc
Actually, I could see a very interesting use for dot-inc; namely that the domain must match the incorporated business name. EG: Hershey's could register The_Hershey_Company.inc, but not hersheys.inc; this would avoid trademark disputes with, say, Hershey_Creamery_Company.inc
No more using product names for domains, Mars.inc could not have a separate Marathon.inc
Oooh.. and wholly owned subsidiaries are relegated to sub-domains: geico.Berkshire_Hathaway.inc