Many thanks to everyone here for your interest in the project, and for your pledges!
As for the transaction authorizations, my credit card does show a pending charge of $1, which indicates to me it is in the process. I know it must be it because I have not used this particular card for anything else from amazon.com.
The whole kickstarter payment interface is completely new to me too, though, this being my first project I've ever followed/contributed to. I hadn't even known what kickstarter was until this event.
But it seems to me everytime you "manage your pledge," as in, move it up or down, you then log into amazon payments as part of the editing process, and it says you will not be charged more than "X" amount for the entire authorization; yet when independently logging into amazon payments again on your own, EVERY authorization from you (all the previous amounts, in my case having been $100, $115, $250, $500, and $525,) are still listed unless and until manually cancelled from inside amazon payments.
I will never know if kickstarter would have autmatically disregarded the previous authorizations and gone for the most recent edit, or if it would have drawn from every transaction, because I went and manually cancelled all the older ones just to be on the safe side.