I've found it is rare that I ever re-read my notes, no matter how much I might think I'll want to when I'm making them. This can be an idea or a long-term to-do list or the outline of a blog post, whatever. If I don't use it immediately after I'm done typing, it never gets read again.
As a result, I've started saving things less and less. However it's still useful to initially type them out. Helps me plan and form my thoughts and ideas. Currently this usually involves opening Textmate or Tumblr (and saving drafts) or email.
Hopefully this will be a solid replacement for all of the above. If I end up typing something I do want to use, then I'll copy and paste it elsewhere. The majority of the time I'll simply close the browser and not save it.