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Results on my machine (MBP 2011)

LLVM 2.8:
./fib  0.11s user 0.00s system 99% cpu 0.110 total

GCC 4.2.1:
./fib  0.35s user 0.00s system 99% cpu 0.357 total

Java 1.7:
java Fibonacci  0.44s user 0.04s system 132% cpu 0.361 total

Scala 2.9:
scala Fibonacci  0.94s user 0.09s system 128% cpu 0.807 total

Rubinius 2.0:
ruby fib.rb  2.10s user 0.04s system 107% cpu 2.000 total

MacRuby 0.10:
macruby fib.rb  2.02s user 0.01s system 99% cpu 2.035 total

JRuby 1.7:
jruby fib.rb  3.18s user 0.09s system 117% cpu 2.796 total

Ruby 1.9.2:
ruby fib.rb  6.62s user 0.02s system 98% cpu 6.725 total

Jython 2.5.2:
jython  15.12s user 0.69s system 122% cpu 12.940 total

Python 2.7:
python2.7  15.79s user 0.04s system 99% cpu 15.845 total

Python 3.2:
python3.2  17.00s user 0.04s system 99% cpu 17.048 total

PHP 5.3.4:
php fib.php  20.57s user 0.06s system 99% cpu 20.660 total

Ruby Enterprise Edition 1.8.7:
ruby fib.rb  35.80s user 0.08s system 99% cpu 35.982 total

Ruby 1.8.7:
ruby fib.rb  42.37s user 0.09s system 99% cpu 42.600 total
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