WordPress MU

I plan up to 25 blogs, each authored and maintained by a separate person. All will be hosted on my domain with the same webhost service. My domain has been getting about 1 million users a month. I've looked through many archived conversations to discern if I should:
1. Use Wordpress MU?
2. Do the blogs on 1 database?
3. Do a different install/database for each blog?

I'm not sure which approach to use. I've been referred to resources which explain how to do each of the above options, but I'm hoping for advice to help me select which option to do.

Advice or a resource that would be useful?

Thanks in advance!

Use MU. It uses 1 database by default. it scales fine. As long as your web account can handle the traffic, MU can handle serving it.

Hey Andrea, do you know why there is a commented 'use multible dbases' setting in a fresh MU install's config.php?

Is there an official way to do this or only through the commercial wmpu.org premium plugins?

I do not think I need it (now), but wondered why it is there, especially seeing the recent catfights between the WP team and the premium team ;-)
Cheers, Harry

The multiple db config has been in there from the start.

http://trac.mu.wordpress.org/browser/trunk/wp-config-sample.php?rev=591

That's from 4 years ago. Remember, wp.com uses multiple dbs as well.

Free plugins for ya:
http://wordpress.org/extend/plugins/shardb/
http://wordpress.org/extend/plugins/hyperdb/