@Locutus - algae would no doubt have to be genetically modified to 'breathe' in the gases in the 'atmosphere' of the new planet, and to 'breathe out' oxygen and the like. Plants could be modified in a similar way to do the same thing, and you'd have a nice human-friendly planet.
@Can't remember who - if a baby was born on the moon it's muscles would be designed during pregnancy to cope with the lower gravity. Same on a new planet. If it was slightly more than Earth's, even a couple of newtons, the muscles would still be slightly affected!
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Estupidud Rex
http://www.cardamine.net/ - should be up and running after Christmas!