Bell has unofficially announced the release date for the Samsung Galaxy S Vibrant through the contest they just started today.
Samsung Galaxy S Vibrant, powered by Android.
If you read the Rules and Regulations, it states that the contest runs between the dates of July 23, 2010 and August 6, 2010 and says it has 15 phones to giveaway.
If you read the Contest details, it says that it will give away one phone per day until the launch date.
Therefore, with 15 phones to give away and the contest ending August 6 at Midnight, the release date sounds like through careful calculations August 7.