Colonizing other places in ours sytem

I've seen lots of sci-fi about making mars 
habitable by giving it an atmosphere (ignoring 
perhaps that the retention of molecules of 
various type is I believe a byproduct of 
gravity!). I've seen similar thoughts about the 
moon. I've seen thoughts about living inside 
domes. And they've talked about (I think) 
Ganymede or some other moons as possible 
places to live. 

But what I haven't seen is anyone suggest how 
we beat the gravity problems. I've seen studies 
by NASA (I believe) and others that seemed to 
indicate that long term exposure to lower or 
zero gravity depressed the human immune 
system in an AIDS like manner. I've seen studies 
that suggest you get bone density problems 
that can't be fully offset by excercise. So, how 
do we live on the moon or mars for a long time 
barring the development of large scale, 
presumably energy consumptive, gravity plating 
that lets us simulate something like 75% or 
better of a standard gravity? I mean this alone 
seems to make Mars infeasible with today's 
tech. We could go there, but it'd do a number 
on us if we tried to live there....

Any thoughts? References? 
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Thomas Barclay
Co-Creator of http://www.stargrunt.ca 
Stargrunt II and Dirtside II game site

No Battle Plan Survives Contact With Dice.
-- Mark 'Indy' Kochte
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