Following her tragic death earlier this month, demand for Whitney Houston's music exploded, with several of her singles and albums roaring up the Billboard charts.  Her presence has also blown up on the Internet, as her play count on YouTube and Vevo increased a staggering 4,523% last week.  Two weeks ago, the R&B legend had a total of 868,000 plays on YouTube and Vevo, and rose to 40.2 million plays last week.