I already mentioned that Donncha’s Sitewide Tags plugin was going to make a whole lot of things much, much easier. Well, DSader wrapped all the awesomeness into one bitchin’ plugin for WPMu: Sitewide “three-in-one” Multi Widget Panel. I discovered it through James Farmer’s WPMU.org (already proving an invaluable resource) and I just had to test it out. Lo and behold, it works like a charm as long as you remember to install Donncha’s Sitewide Tags plugin.
What’s more, DSader notes that this plugin can also be edited to…
pull from multiple blogs by editing one line of code ("clones" the widget output while applying the same widget control options to each clone):
<code>
`$featured_blogs = array($options['blog_id']); // Clone multiple panel outputs such as …
// $featured_blogs = array($options['blog_id'],3,354);`
(inspired by http://dailytestimony.net/plugins/)
In other words, there may be a way to select a specific number of blogs from a WPMu installation that can be fed into a specific tag cloud. Now this would be an awesome plugin in and of itself, for it could provide a way to aggregate tags for a series of distributed student blogs for a course, which could then be presented back on the mother blog as the course tag cloud. Something similar to what I was imagining way back when in this post.
Anyway, awesome work fromDSader and if you’re itching to see the plugin in action, I have it running on UMW Blogs already 
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A tag link becomes hxxp://tags.umwblogs.org/blog/tag/as450/ when it should be hxxp://tags.umwblogs.org/tag/as450/
In a non-vhost(my case) tags become hxxp://umwblogs.org/tags/blog/tag/as450/
instead of hxxp://umwblogs.org/tags/tag/as450/
I’ve reported this phenom at hxxp://ocaoimh.ie/2008/07/19/sitewide-ta…
Again this only happens on the main blog with permalink enabled.
Also, Can you verify . . . ?
I’ve tried turning off options-permalinks in the home blog(default structure = /?p=123) and the tags don’t 404 anymore. However, when I save a page/post in the home blog with permalinks off and then go write a new post in the tags blog new “Custom Fields” appear Key=”permalink” and value=”?p=123″. The more posts/pages I save in the home blog, the more Custom Fields appear in the tags blog. Hmm.
First of all, thanks for the awesome widget. It is quite the combination of greatness, beautifully conceeved, designed, and executed.
Now, I turned off custom permalinks like you instructed and the tags now work. As for the tags blog, I can confirm the “Custom Fields” and “Key=Permalink,” etc. show up as you said. Is this something that will mess up the link on the tags blog? It seems to be working fine? Is, perhaps, the custom field recording this because the original was using a different permalink structure than the tag blog?
Ignorantly yours
I have another wrinkle which is interesting. I am working on a redesign for UMW Blogs, and as I was testing the site I noticed that a sitewide tag cloud that is not the home blog has none of these issues. Take a look at this sitewide tag cloud on a random blog in the environment: http://siteredesign.umwblogs.org/
Strange, I hope they do fix it, and as for those thousands of posts, I feel your pain, version 1.0 of that plugin gave my carpel tunnel syndrome