Written in response to something Monster Coder wrote.
In december, Prelovac (a very well known coder in the WP community) will release the source of http://managewp.com/ which allows fully managing remote WordPress installs. Since Prelovac and probably his whole team have been working on this for a few months now (launched in April), chances are in december they'll launch something much more mature than what you would do alone in one month.
Might be worth to wait and check this.
(Source released announced here: http://www.prelovac.com/vladimir/retrospective-of-2010-third-year-online )