Live Blog is compatible with Live Writer. Live Writer supports Offline Publishing.
How Do I Post through Windows Live Writer
If you don't already have Windows Live Writer installed then you may download and install it from: http://explore.live.com/windows-live-writer
Launch Windows Live Writer and follow the prompts:
Select Other Services and click Next
Type in the URL of the page where you have the Live Blog module installed.
Provide the username and password for authentication. You must have access to "Authors" & "Remote Access" Permission
Specify a name for this blog and you're done!