We Have written a small freeware program to do just what the orginal poster was looking for. Check out Forum Formatter. The information is below, the download link will be posted as soon as we can post external links. Donations are appreciated for continued Development.
Have you ever been online, busily writing on one of your favorite message boards or online forums, and suddenly your browser crashed? You open it back up, only to discover that the precious post that you were busy writing disappeared along with it?
Forum Post Loss? Browser accidents? Accidental shutdown or Crashes? Forum formatter is designed to prevent you from losing your forum or message board posts in the event that your internet fails, your browser crashes or you accidently shut down a tab or page containing an important post.
Using this piece of software, you can write forum posts and messages while offline using a simple, straightforward WYSIWYG interface such as you will find on the internet itself. Posts can be written, saved and reopened later for further editing or posting. The interface contains most, if not all the tags common to most forums, with the exception of forum specific features. You can also preview your post in a simple viewer, and print if you so desire.