Before getting into yet-another-pointless language war, here are some recent numbers. Argue less, code more.

anti_lang_war.sh

#!/bin/sh

time python fib.py

rvm use 1.8.6
time ruby fib.rb

rvm use 1.8.7
time ruby fib.rb

rvm use 1.9.1
time ruby fib.rb

rvm use 1.9.2
time ruby fib.rb

rvm use jruby
time ruby fib.rb

javac Fib.java
jar cf Fib.jar Fib.class
time java -classpath Fib.jar Fib

gcc -O2 fib.c -o fib
time ./fib

fib.c

#include <stdio.h>

int fib(int n)
{
	if (n == 0 || n == 1)
	{
		return n;
	}
	else
	{
		return fib(n-1) + fib(n-2);
	}
}

int main()
{
	int i;

	for (i=0; i<36; i++)
	{
		printf("n=%d => %d\n",i,fib(i));
	}

	return 0;
}

Fib.java

public class Fib {
	public static int fib(int n) {
		if (n == 0 || n == 1)
			return n;
		return (fib(n-1) + fib(n-2));
	}

	public static void main(String[] args) {
		for (int i = 0; i < 36; i++)
			System.out.println("n=" + i + " => " + fib(i));
	}
}

fib.py

def fib(n):
	if n == 0 or n == 1:
		return n
	else:
		return fib(n-1) + fib(n-2)

for i in range(36):
	print "n=%d => %d" % (i, fib(i))

fib.rb

def fib(n)
  if n == 0 || n == 1
    n
  else
    fib(n-1) + fib(n-2)
  end
end

36.times do |i|
  puts "n=#{i} => #{fib(i)}"
end

my_numbers.txt

Linux localhost 2.6.28 #8 SMP Sun May 9 22:53:00 PDT 2010 x86_64 AMD Athlon(tm) 64 Processor 3400+ AuthenticAMD GNU/Linux

python 2.6.4:

real	0m36.433s
user	0m34.850s
sys	0m0.080s

ruby 1.8.6:

real	1m1.663s
user	1m0.200s
sys	0m0.160s

ruby 1.8.7:

real	1m11.179s
user	1m9.000s
sys	0m0.240s

ruby 1.9.1:

real	0m13.813s
user	0m12.550s
sys	0m0.030s

ruby 1.9.2-preview1:

real	0m14.846s
user	0m13.550s
sys	0m0.070s

jruby 1.4.0:

real	0m30.871s
user	0m25.800s
sys	0m0.360s

java 1.6.0_0

real	0m0.577s
user	0m0.360s
sys	0m0.030s

C:

real	0m0.292s
user	0m0.240s
sys	0m0.010s

One should note, that I'm running the OpenJDK 64-Bit Server VM. Currently a 64-bit Client VM is still not available. The increased start-up time of the Server VM impacted the total run-time of JRuby, but did not seem to effect the compiled Fib.java.