Hey! Currently you can only donate to CDEX using Paypal, but I think if you were to accept Bitcoin as donations you would get some extra money as well.
Bitcoin is a peer-to-peer currency that can be used to exchange goods and services online, digital and otherwise, without fees.
See http://www.bitcoin.org and http://www.weusecoins.com for more info.
It is widely being used, here is a list of some of the businesses using bitcoin:
Just install the bitcoin client and post a donation address somewhere on the main page and start accepting bitcoins instantly! I would also post a donation thread for you guys on bitcointalk.org which has 45,000 members and I can bet a large portion of those users have used CDex in the past.