I backed a Kickstarter in Australia with my CSP tonight and I'm happy to report that they didn't try to DCC me. ^ Normally Kickstarter sends you to Amazon Payments to complete the transaction, but I guess they only do that for US based ones. It's also good that I have a FTF free card because otherwise it'd be a surprise for not so good reasons.

EDIT: actually, the Chase emails I got after they authorized my card show the amount in USD, not AUD. I'll probably know more once the Kickstarter finishes but according to Visa's exchange rates for 8/15, AU$1 = US$0.933107 and the authorization on Chase's online banking is for $0.93 so it's probably still a good bet that I didn't.