Ruby +=
Skipped

Ruby <<
0:00.68 real, 0.63 user, 0.04 sys

Python 2.4 +=
0:00.91 real, 0.25 user, 0.65 sys

Python 2.4 .append()
0:00.44 real, 0.26 user, 0.19 sys

Python 2.4 StringIO
0:01.01 real, 0.98 user, 0.03 sys

Python 2.5 +=
0:00.92 real, 0.30 user, 0.61 sys

Python 2.5 .append()
0:00.40 real, 0.35 user, 0.05 sys

Python 2.5 StringIO
0:00.98 real, 0.86 user, 0.11 sys

Perl .=
0:00.88 real, 0.58 user, 0.31 sys

Perl join
0:00.37 real, 0.25 user, 0.12 sys