Save Drafts

I was wondering if people thought it would be a good idea to be able to save drafts of e-mail blasts, discussion posts and group blog posts. 

I would find it helpful to have and auto-save feature just because I've found the need to navigate away from the posting page (i.e. to create a new category), and the only way to save what I've written is to copy-paste. 

Note:  I know there's a work-around with group blog posts...I can just tell it to publish later, and that'll give me time to edit it before it goes public.