Official opinions depend on who you talk to.
There was a study done which appeared to show a signifigant link between raised bowls and bloat. But after looking closer at it, and the arguments against it, I have to agree with the folks who say the study was flawed. Basically a very large number of dogs in the study were fed from raised bowls, so its not surprising that a number of the dogs who bloated were fed from raised bowls, and the study didn't adjust their numbers to take that into account.
I personally think that whether you feed from raised bowls or not should be dependant on your dog. You don't want the dog GULPING their food, because that leads to gulping air, which can lead to bloat. If he eats with less gulping from raised bowls, then feed from raised bowls.