This is also very cool: http://www.spore.com/comm/prototypes As far as I know Spore is the first game to publish this kind of previous work, and not just the source code (some games published design docs, and a lot of games published postmortems too, but entire working prototypes? I've never seen that).
Introversion Software released a lot of development stuff for their game Uplink (tagline: Trust is a Weakness) on a separate CD. You can download the contents of the CD from their site as well: http://www.introversion.co.uk/uplink/otherfiles.html
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