So far (by week 51, December 22) (US=soundscan numbers, WW=UWC points)
Taylor Swift
US: 2,382,541
WW: 3.154.000
Pink
US: 741,011
WW: 1,904,000
Alicia Keys
US: 236,515
WW: 440,000
Christina Aguilera
US: 153,952
WW: 198,000+ (can't track anymore cos out ouf the top 40)
Ke$ha
US: 86,000
WW: 113.000
I still think Pink will pass Taylor worldwide in about a year or so

and Ke$ha should be able to jump Christina, cos she can actually score hits