Not being able to play Mass Effect for PC has been aching me for quite a few months, so first hearing that the port would be released on May 6th in North America certainly made me smile. But this post on the official Mass Effect forums from Community Coordinator Chris Priestly notes that there's been a delay.
The new release date for North America is May 28th and for Europe is June 6th. Priestly briefly mentioned that BioWare and Demiurge Studios needed the extra weeks for additional polish and fine-tuning. Hey, some extra polishing for an already excellent game sounds fine to me.
Here's the word on the delay from the man himself, "The team here at BioWare, working closely with the good folks at Demiurge Studios, has decided that a few more weeks in the studio will ensure we deliver the quality that our fans deserve. The additional time will allow us to incorporate more play-testing feedback, add extra polish and tune the additional features so that Mass Effect is a natural and outstanding PC gaming experience."
In related news, here are three new screenshots showcasing the revamped user interface and the new decryption game.

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New complex decryption mini-game?! Now I'm sold!
I hope it's better than the minigame in Bioshock. Those damn pipes...
I wonder if they will update the 360 version?
Is this a 3rd person profile shooter?
Leon, for the combat, think Gears of War. And that new decryption system looks interesting.