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WPMU: Setting up Permalinks

WPMU, by default, has a really ugly linking system for example look like this: http://www.ag.auburn.edu/fish/?p=463.

Now within WPMU Administration you can customize these links, which are created on the fly, fairly easily.

The obvious choice or solution would be to change said strucutre to this: %/postname%. This is a bad idea.
Reasoning is this, WPMU first checks the URL to see if it is a page before looking to see if it is a post. Therefore in my opinion the most efficient structure would be: %post_id%/%postname%

Remember you have to be an admin to perform this action. I strongly suggest this being done right after installation as changing the linking structure on an already successful blog could have catastrophic effects.