Suggestions for an offline CMS?

I am looking for a way to create a blog (with some other informative pages) using offline CMS.

What I mean by "offline CMS" is:

• I should be able to write using a markup which is abstract (not HTML, or XML). Something like the MarkDown or Textile systems.
• The entries will be edited offline on my PC
• When I am done, I will need to (re)generate the final HTML output and rsync it to my server.
• For page comments, I can use something like the Disqus service.
• In effect, the final site will be static.

Nice to have feature: Support for categories, tags, and other such navigational aids.

Is there anything like this out there?

Edit: Opensource/Free, cross-platform tools preferable.

Edit #2 Thanks to Adam, I found a similar question on SO.

What you are looking for seems to be a static site generator. There is Jekyll written in ruby which supports both Textile, and Markdown. Its old homepage used Disqus. It seems to fit your needs. There is also the django-based Hyde.