My view is that proceeds from any donations, if they are accepted, should go towards day-to-day expenses of the society (as opposed to the website, which is run on a not-for-profit basis on behalf of the society). The way this would ideally work is that there would be a treasurer who chooses how to spend the money and is responsible to the society's membership.
That said, given that there is currently nobody (to my knowledge) doing any work for the society which involves expenses of any kind, pizaaplanet's suggestion of donating all proceeds to charity seems like the least bad option, if we are going to accept donations. Ideally, though, I'd like to see a membership model where any costs simply cover the membership pack, and donations treated as a separate issue (outside this thread).