I'd have to agree with some to most of the article, but the fact that about 2/5 of it specifically refer to GConf is telling of something. Perhaps that GConf sucks. I've yet to understand what was wrong with home directory dotfiles. I don't think that Unix really needs a mostly unhandeditable Windows-like registry.
Specifically, extensible filesystem metadata makes a lot of sense, but it'll take a long time before it's used extensively, even if such a paradigm shift could take place. Of course, this is hardly an original idea. BeOS had it to some extent, as did MacOS prior to MacOSX.
The security benefits involved in some of it makes sense, but I think that the way he goes about it might be a little over the top.
Oh, and remember, LDAP is only useful for login information, apparently.
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Bitt Faulk