A weaker dollar has done wonders for the mining sector, making the dollar-denominated commodities cheaper to foreign buyers.Antofagasta, Kazakhmys and Rio Tinto are among the best of the bunch, although a number of resource plays are trading around two-year highs.Automobiles & Parts also stands out as key component GKN extends its four-month rally. Last week, it reported a 21% leap in third quarter sales and profit before tax that more than doubled.Electricity fizzled out though as investors ditched defensive stocks. That damaged International Power and Scottish & Southern Energy.Top performing sectors so far todayMining 25,220.57 +2.78%Automobiles & Parts 4,379.20 +2.24%Health Care Equipment & Services 3,256.08 +2.20%Personal Goods 17,655.21 +2.13%Technology Hardware & Equipment 593.11 +1.88%Bottom performing sectors so far todayAlternative Energy 2,729.59 -0.97%Electricity 7,002.59 -0.70%Banks 4,963.18 -0.54%Life Insurance 4,123.19 -0.18%Tobacco 28,366.61 -0.12%