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The difficult bit is writing your own package :)
As far as I know Blogger will let you update via FTP, so no software is necessary. You just give them the FTP login info for your site's host.
Yes, I too was wondering what it is specifically that people do when they create a "blog" on their own site... is it not simply a page full of <p>'s that they update on a regular basis? I suppose you could turn it into a database thing if you're going the RSS route... but it seems to me the only difference between a blog and a page of paragraph elements is the word "BLOG" at the top.
That'd be a very basic blog. However, most have the ability to add comments, trackbacks, etc.