Construction of the bridge started in 2004, but there was a major accident during September 2007 when a 90-metre section of an approach ramp to the bridge collapsed, killing over 50 and injuring around 140 of the construction workers (the exact numbers differ in various reports). Here's a video report from Vietnam television of the rescue efforts following the disaster:
Construction recommenced 11 months after the accident. It opened to traffic yesterday:
The bridge links Vinh Long province with Can Tho, a major city about 170 Km south of Ho Chi Minh City ("Saigon") and is expected to improve traffic flow dramatically to the southern provinces and to boost the economy of the region.
(Having visited and lived in Vietnam for several years I remain interested in what is happening there, even if I have somewhat ambivalent views about the country.)