the one thing i should say in google's defense is that i guess you could make the case that they dont want people to be making "donations" and then assuming they are tax deductible.
the thing that upsets me about google checkout though which makes it really unfriendly to sites like ours is that you cant let the user choose how much to give, as you can with amazon and paypal.
for me, paypal is still the clear best choice.