Making each blog’s tags, site-wide (like wordpress.com)

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Hello,

I’m hoping you’ll be able to tell me there’s already a plugin for this, but I’d like to join all blogs on my WPMU install in the way that wordpress.com have. This way, when you click on a tag on a single blog, you are taken a a list of all posts tagged with that tag on the entire install.

On wordpress.com, categories behave like tags on wpmu, in that they link to other posts on the particular blog, but tags link to posts on other blogs.

Thank you

Joss