This page collects some pystone numbers for various Mac models.  As bad as the pystone benchmark is as a useful figure of merit, my intent is as much to compare various Mac models as it is to compare different Python versions and implementations.  (I'm in the market for a new laptop.)  If you have some numbers for various Macs, please add row(s) to this table.  Please at least use /usr/bin/python to run pystone, something like this:

{{{
/usr/bin/python /usr/lib/python2.3/test/pystone.py
}}}
({{{python2.3}}} will change according to version of Python shipped with your Mac.  Run the command three times while your computer is otherwise idle then insert the largest pystone number in the table (rounded to the nearest pystone).  {{{/usr/lib/python2.3/test/pystone.py}}} should work for all Python 2.x versions.  If you report numbers for Python 3.0 you will have to use the pystone.py which comes with it.
||Model ||CPU ||Speed ||Mac OS X Version ||Python version ||Pystones ||Reporter ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||/usr/bin/python (2.3.5) ||11905 ||SkipMontanaro ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||python from source (2.2.3+) ||10776 ||SkipMontanaro ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||python from source (2.4.4) ||14663 ||SkipMontanaro ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||python from source (2.5.2a0) ||15625 ||SkipMontanaro ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||python from source (2.6a0) ||15384 ||SkipMontanaro ||
||!PowerBook ||G4 ||800MHz ||10.4.11 ||python from source (3.0a2) ||11338 ||SkipMontanaro ||
||Power Mac ||2xG5 ||2GHz ||10.4.11 ||/usr/bin/python (2.3.5) ||28410 ||SkipMontanaro ||
||Power Mac ||2xG5 ||2GHz ||10.4.11 ||python from source (2.6a0, 32-bit) ||35461 ||SkipMontanaro ||
||Power Mac ||2xG5 ||2GHz ||10.4.11 ||python from source (2.6a0, 64-bit) ||37313 ||SkipMontanaro ||
||Power Mac ||2xG5 ||2GHz ||10.5.6 ||/usr/bin/python (2.5.1 r251:54863) ||30307.4 ||SkipMontanaro ||
||!MacBook Pro ||Core 2 Duo ||2.2GHz ||10.4.11 ||/usr/bin/python (2.3.5) ||38462 ||GaryBernhardt ||
||!MacBook Pro ||Core 2 Duo ||2.2GHZ ||10.4.11 ||universal mac build (2.5.1) ||49505 ||GaryBernhardt ||
||!MacBook Pro ||Core 2 Duo ||2.2GHz ||10.5.1 ||/usr/bin/python (Python 2.5.1 (r251:54863)) ||46453.6 ||ThomasJuntunen ||
||!MacBook Pro ||Core 2 Duo ||2.2GHz ||10.5.6 ||/usr/bin/python (Python 2.5.1 (r251:54863)) ||46776.1 ||SkipMontanaro ||
||!MacBook Pro ||Core 2 Duo ||2.2GHz ||10.5.6 ||Python 2.6.1+ (release26-maint:70232) || 51437.2 || SkipMontanaro ||
||!MacBook Pro ||Core 2 Duo ||2.33GHz ||10.5.1 ||/usr/bin/python (Python 2.5.2a0) ||52083 ||RonaldOussoren ||
||!MacBook Pro ||Core 2 Duo ||2.33GHz ||10.5.1 ||/usr/bin/python (Python 2.5.2a0, 64-bit) ||60871 ||RonaldOussoren ||
||!MacBook Pro || Core 2 Duo ||2.4GHz ||10.5.1 ||/usr/bin/python (Leopard version) ||49958 ||DavidReed||
||!MacBook Pro || Core 2 Duo ||2.4GHz ||10.5.1 ||/usr/local/bin/python2.5 (python.org version) ||54945  ||DavidReed||
||iMac ||Core 2 Duo ||2.4GHz ||10.5.1 ||/usr/bin/python (2.5.1) ||50613 ||KevinHorton ||
||iMac ||Core 2 Duo ||2.4GHz ||10.5.1 ||/sw/bin/python (2.5.1 from Fink Project) ||55254 ||KevinHorton ||
||iMac ||Core 2 Duo ||2.4GHz ||10.5.1 ||universal mac build (2.5.1) ||56180 ||CharlesMoad ||
||iMac ||Core 2 Duo ||2.8GHz ||10.5.1 ||/usr/bin/python (2.5.1) ||59101.5 ||NicholasRiley ||
||Mac Mini ||Core Duo ||1.66GHz ||10.4.11 ||universal mac build (2.5.1) ||37878.8 ||BlakeWinton ||
||!MacBook ||Core 2 Duo ||2Ghz ||10.5.1 ||/usr/bin/python (2.5.1) ||41593.7 ||JackJansen ||
||Mac Pro ||Quad-core Dual ||3.0GHz ||10.5.11 ||universal mac build (2.5.1) ||63019.7 ||DanielLord ||
||Mac Pro ||Quad-core ||2.66Ghz ||10.5.1 ||/usr/bin/python (2.5.1) ||62578.2 ||JackJansen ||
||Mac Pro ||Quad-core ||2.66Ghz ||10.4.11 ||universal mac build (2.5.1) ||63291.1 ||NicholasRiley ||
||Mac Book ||Dual ||2.16 GHz ||10.5.1 ||universal 2.5.1 ||44578.2 ||BrianRay ||
||!MacBook Pro || Core 2 Duo ||2.33 GHz ||10.4.11 ||Python 2.4.4 (build 5341) ||40650.4 ||EricLewin ||
||MacBook Pro  || Core 2 Duo ||2.2 GHz ||10.6.2 ||Python 2.6.1 (r261:67515) ||58225||JoaoRodrigues ||

Here's a table for iPhone and iPod Touch devices.  If you have a device which was jailbroken it's likely that Python is available for it.

||iPod Touch 1G || ARM || 412MHz(?) || iPhone OS (Firmware 2.2.1) || Python 2.5.1 (r251:54863) || 1192.75 || SkipMontanaro ||

||iPod Touch 3G || ARM Cortex A8 || 600MHz || iPhone OS (Firmware 3.1.2) || Python 2.5.1  || 4717 || JoaoRodrigues ||