New in Wolfram Mathematica 7: Built-in Parallel Computing  previous | next 
Automatically Parallelize Computations
Wrapping the Parallelize command around your computations often provides a convenient way to run them in parallel. This shows how a set of visualizations can be computed more quickly by generating them in parallel.

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 Map[StreamPlot[#, {x, -3, 3}, {y, -3, 3}] &, 

  Flatten[Table[ {x^i y^j, x^j y^i}, {i, 2}, {j, 2}], 1]]]