fastest way to get Min from every column in a matrix?

Question

What is the fastest way to extract the min from each column in a matrix?

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EDIT:

Moved all the benchmarks to the answer below.

Using

Answer 1

lapply( split(mat, rep(1:dim(mat)[1], each=dim(mat)[2])), min)

which( ! apply(my.mat, 2, min, na.rm=T) ==
        sapply( split(my.mat, rep(1:dim(my.mat)[1], each=dim(my.mat)[2])), min) )
# named integer(0)