OK, i guess it is the closing time for the first round.
May I suggest the exchange rate as follow:
Bitcoin -> USD (MtGOX bid+Ask /2 ) -> JPY
1 BTC = MtGox (0.85+0.86) /2 = 0.855 USD = 0.855 x 79 JPY = 67.54500 JPY
250 BTC = 250 x 67.54500 = 16 886
By the way, how much exactly do we have right now?
The Yen has been climbing since the earthquake. I hope it doesn't get any stronger !!

The donation can be made in the post office or the Post Bank (basically the same thing).
They ask for Name, Address & telephone to put into the donation form.
I will try to put the following information. However, sometimes, the Japanese are not very flexible. They might insist on real street address.
Name : bitcoin or bitcoin.org or bitcoin community (Which one would you prefer

)
Address: bitcoin.org
Tel: not sure, do bitcoin have a phone number ??
If you have any suggestions, please let me know.
Depends on the responses here. Maybe we could make the donation before the weekend.