Pypy on Project Euler

Today, I ran some tests with pypy and my few Project Euler solutions:

Solution	Python 2.6.6	PyPy 1.5	Factor
7	9.57s	1.92s	4.98
7_b	0.52s	0.14s	3.71
9	0.51s	0.10s	5.1
14	6.70s	6.97s	0.96
25	1.25s	0.68s	1.83

I guess the main message to take home is (see especially 7 and 7_b): a good algorithm is way more important then the interpreter, but if you can choose (e.g. you don't need numpy), then why not use PyPy and gain some speed?

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