Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Reopen page proof reviews once every requested fix is done.
Your reviewer gets the corrected proof and completed fixes when the last correction is done, so the next decision does not sit in rework.
Attach missing marked page proofs to the matching revision cards.
Your makers find the marked PDF on their revision cards, with the reviewed version noted when a handoff missed the file.