60W vs. 85W charger for MacBook (aluminum)

Is there any reason why I can't use the 85W charging unit for a MacBook? I know it comes with the 60W version. Would the larger unit overheat the battery? I want to buy a second Magsafe charging unit to keep at the office and since they are both the same price would like to know if I would cause any damage by using the larger unit.
Also, noticing comments in another topic talking about battery cycles, isn't it bad to leave a computer on the charger 98% of the time? Shouldn't it be disconnected once the battery is fully charged? Is there circuitry that protects the battery if it's left on charge?

I sorta have the opposite question.
A friend and I both have Late 2008 Macbooks - but I have the Pro. I was using his 60W charger with no problems, except it was a little slow to charge - but I just needed a little top up.
I then switched to Vista to play Crysis and after about 30 minutes, between levels there was some silence and I heard a strange squeaking noise coming from the 60W adapter.
Needless to say I immediately unplugged it.
This then led to an interesting series of tests where we established that that on a scale of lots of noise to no noise, the 60W adapter behaved as follows:
Vista on MBP (Lots of noise)
Mac OS X on MBP (Some noise)
Vista on MB (less noise)
Mac OS X on MB (no noise)
This is a little disturbing... For now I will only be using 85W adapters with my MBP, but what about vista on his MB? Could he fry his adapter?

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