I have always blogged offline when I could, using a client and editing and uploading or in the case of my work blogger accounts (http://freightandlogisticsnews.blogspot.com/) using email to directly feed multiple blogs and sites for dissemination.
Recently I have become far more aware of how ephemeral my computers are. Even with stable operating systems and software that I enjoy using, my tendency to tinker means that my home PCs are an ever evolving and changing series of platforms. Eventually I screw up, and when that happens life is so much safer when data is either on my new Buffalo NAS fileserver or, in the case of less important data such as bookmarks or blogs, online. Thus this.. my dalliance with online blogging using Firefox add-ons to try and support and improve the richness of my blogs.