I'd certainly look into some of the other companies that have been mentioned - except Bitcoin.
There's no reason to close off potential revenue sources -- especially something relatively simple to setup such as bitcoins.
You can "mine" them for free on your own computer, the value fluctuates wildly, and they've only really been widely promoted by such organizations as Anonymous.
I fail to see how being able to mine them for 'free' (not really -- the cost of electricity makes mining unprofitable for everyone except enthusiasts or gamers) is a slight against them. The bitcoin infrastructure is decentralized, meaning no organization issues currency or collects fees; the miners are responsible for keeping the security of the network high enough to prevent transaction reversals.
The value does fluctuate wildly, but by the very nature of the system, it will trend upwards over time. A bitcoin donation of 5BTC today might only be worth 25USD. A month from now, it could be worth 30. Bitcoins are volatile, yes, but that's why you cash out frequently. The need to pay for servers sort of means this would happen anyway.
Along with groups like Anonymous, there are quite a few legitimate organizations who support bitcoin. It's not inherently evil or wrong because of a few bad apples.
The system has been hacked to failure at least once.
No. The central bitcoin architecture has never been compromised. It's been open from the start, so you could even say it's impossible for it to be compromised. What has been compromised are bitcoin banking sites such as Mt. Gox -- if you're using bitcoins properly, you wouldn't be keeping your funds stored outside of your own wallet, and hence not susceptible to such hackings.
Also, as it's been noted in conversations about Bitcoins on other sites, technically such an alternative currency is illegal in the United States - there have been cases of tourist towns, trying to use their own cutesy currencies, that have been told ixnay by the Feds. I don't think they'd be so gentle if BitCoin were to start seeing wider use.
This isn't even going to be an issue for years and years and years, and good luck to the Feds trying to shut down bitcoins by then. Bitcoin usage will never become mainstream or widespread, but it will be a viable (and potentially anonymous) alternative currency with its own uses. I doubt I'd ever buy my groceries with BTC, but if I needed to send money to a friend overseas and wanted to bypass banking fees and regulations, I'd use bitcoins. And it only takes 15 minutes!
Lastly, considering the strength of the Euro, and the relative weakness of Bitcoins, I'd want to go with something a bit more stable, i.e. credit card processing. It's even easier for us USD users, as I can watch the exchange rate and make a credit card donation on a day when the exchange rate is a smidgen better.
I'm not suggesting BakaBT switch to using bitcoins exclusively -- that would be ridiculous and unsustainable. However, allowing bitcoins as an alternative would help mitigate the damage issues (such as the current one) cause. There's literally
no risk of BTC payments failing to go through, or your funds being frozen.