The “Stanford Encyclopaedia of Philosophy”:http://plato.stanford.edu/ is looking to do some fundraising to cover its (very modest) costs. The details are “here”:http://plato.stanford.edu/fundraising/.
At risk of offending practically every reader of this site, I think this is one of those rare cases where a little advertising would go a long way towards covering costs. If the SEP set up an “Amazon associates”:http://www.amazon.com/gp/browse.html/104-2361775-7843169?node=3435371 account, and converted every reference to an in-print book to a live Amazon link, they could raise a huge amount of money with minimal intrusiveness. And it might lead to more philosophy books being sold, which seems to be a good thing.