I set up a bitcoin address for the space on Coinbase a while back. Not sure what state I left that in, I think I wanted to make sure I wasn’t the sole owner, and Coinbase was rolling out some of those features. Let me check.
UPDATE: Coinbase makes it very easy. I’m talking with other staff, we’ll get an address going soon, along with a public-facing page to make bitcoin donations easy.
As far as Coinbase fees go, they only charge 1% to buy or sell bitcoin to/from other currencies. And through merchant processing, the first $1 million is free. We don’t pay fees to Coinbase when receiving donations.