I saw a a neat trick the other day for controlling revisions on drawings. each revision has a revision cloud, using the Vectorworks revision cloud tool, and a stamp, using the Vectorworks revision stamp. The clouds and bubbles are placed in the Annotation part of each viewport.
But that is not the neat trick. The neat part is that each cloud and stamp is assigned to a class. So the bubble and stamp for revision A is assigned to the class Revision-A. And the revision B is assigned to the class Revision-B and so on.
This allows you to control the revision bubbles and stamps from the Object Info palette, by changing the classes on each viewport.
Once I realized what what was going on, I thought this was really cool.