Since you mentioned Sprint, I will say that we sent a request to ARIN
to get Vab off our records over a month ago. They have promised me
that this will be in effect tomorrow.
Perhaps the new modification template Kim announced will help. One
thing that would also be cool would be a way to search on a particular
ARIN-handle to find out if someone who left your company is listed on
any of your records. Unfortunately, with spammers using whois the way
they do, this would probably be too easy to abuse.
Sarah