Yep, thats right, dated in Australia on the Xbox.com website!
http://news.teamxbox.com/xbox/12694/Mass-Effect-Dated-in-Australia/
May 18? Holy crap I wasn't expecting it that soon, I was thinking July or something... My girlfriend might not even see me for her B-day if it comes out on or before May 18. Damn, this has got me all sorts of excited!
The Australian Xbox.com web site has revealed the release date for Mass Effect in the Land Downunder. According the product's web page, Mass Effect will launch down there on May 18, 2007. We don't expect this title to arrive earlier on any territory before it hits North American retailers, so this Australian release date confirms that we can expect this UE3-powered action role-playing game before the four week of May.
Mass Effect is a science-fiction action and role-playing game created by BioWare, the commercially and critically acclaimed RPG developer of “Jade Empire™” and “Star Wars: Knights of the Old Republic.” Mass Effect will deliver an immersive, story-driven gameplay experience with stunning visual fidelity. Published by Microsoft Game Studios, Mass Effect is an exclusive title for the Xbox 360 video game system.

Mass Effect is a science-fiction action and role-playing game created by BioWare, the commercially and critically acclaimed RPG developer of “Jade Empire™” and “Star Wars: Knights of the Old Republic.” Mass Effect will deliver an immersive, story-driven gameplay experience with stunning visual fidelity. Published by Microsoft Game Studios, Mass Effect is an exclusive title for the Xbox 360 video game system.
May 18? Holy crap I wasn't expecting it that soon, I was thinking July or something... My girlfriend might not even see me for her B-day if it comes out on or before May 18. Damn, this has got me all sorts of excited!