Selectively keeping revisions around

[Kurt Mackey]

I'm admittedly pretty new to CouchDB, but I'm having a tough time  
figuring out how to use the document revisions it keeps around.  As I  
understand it, PUTs replace what's there, leaving what's there in a  
deleted state until you compact the database, at which point it goes  
away forever.

So given that (and correct me if I got it wrong), what's the best way  
of keeping revisions around forever?  I have a number of documents  
that will be changed quite frequently, and I'd like to get at their  
history, provide diffs against it, etc.  Is anyone doing this?

-Kurt