Garbage collection progress delegate

[Craig Black]

Given the current state of things, garbage collection could cause dramatic 
pauses.  Is there any way that the garbage collector could have some 
delegate to post its progress?  The delegate would be invoked passing the 
estimated length of time it will take to perform the collection, say once 
every second or once every half a second.  This allow the application to 
post the progress to give the user feedback as to what is happening and how 
long it is going to take.

-Craig