Generate Pascal's Pyramid
Python, 110

l=1
exec"print;n=1;r=0;exec\"c=0;exec'print n,;n*=r-c;c+=1;n/=c;'*r;print n;r+=1;n=n*l/r-n;\"*l;l+=1;"*input()


Original, ungolfed solution:

for layer in range(1, input() + 1):
    print
    n = 1
    for row in range(1, layer + 1):
        for col in range(1, row):
            print n,
            n *= row - col
            n /= col
        print n
        n *= layer - row
        n /= row