According to the Alzheimer's Association, deaths attributed to the disease have increased by more than 46 percent between 2000 and 2006. Today, in the United States alone, 5.3 million people have Alzheimer's disease, and its annual cost is $172 billion. What new answers has medical science has come up with? At best, it's good news and bad news. Medical progress marches on in its usual lurching way--many failures mixed with some progress. Here's a rundown of what's on the market, recent drug failures, pipeline prospects and the most recent research from the the laboratory trenches. Article