(I'm the person who put these sites up by the way!)
I agree that dmoz.org is probably the best place for the directory information, and perhaps we should put more effort in that direction instead of into this old thing of mine. It's just that I find the Category Editor model unappealing, and I find the dmoz approach to updating submissions rather awkward.
In short, this whole thing is based on the assumption that most folks would probably have the time to keep their own entries up to date, but that too few people have the time to keep a whole dmoz category up to date. I'd actually prefer to be proven wrong on this point.
Perhaps it is possible to automagically synchronize the dmoz and Nutshells directories? e.g. The Nutshells site becomes an interface for making the submission of updates to dmoz really easy? Ideas welcome!
Of the suggestions I have already received about the site (thanks folks!), one that stands out is that the 'nutshells' idea should perhaps be used for storing FAQ-style information. Indeed, this was the idea behind the 'Solutions' section, perhaps with links to longer articles in the actual Wiki? This kind of thing may be a more use than yet another link directory.
I'll be adding the suggestions to the Wiki as they come in - feel free to add your own!