Doesn't matter. The donation was not promised in USD so it's 1000 BTC no matter what the rate is.
I want to see a charity announcing "thank you for the 1000 BTC donation" and not weasel words from BFL!
BFL is in the unique position of getting an NPO to embed a Bitcoin donation onto their website as a simple term in accepting the soon to be quarter million dollar donation.
Surely they're not thinking about photoshopping some document proving that $X was sent to Charity Y, otherwise...
Me: Hello, Charity Y.
CY: How can we help you today?
Me: I donated money to BFL in your name and they said that they sent you $X (1,000 BTC). Did you receive... Why are you laughing?
CY: Sorry, but the check they sent us bounced like a rubber chicken. They did give us a voucher... Why are you laughing?
Me: Was the voucher for 25% off the future order of chicken feed... Why are you laughing?
CY: No! It was for some sort of their out-of-stock money mining machine manufactured by some guy who used to be in the lottery business and the son of some guy who once ran for governor of Nevada. I think I peed my pants.