I actually think what Innomen is saying makes a lot of sense. Switching to Linux will not be possible for people who can barely operate Windows. It is not us, the technical people that need to worry about this, but since we try to convince more and more people to start using Bitcoin (for example I got a few of my friends into using Bitcoin, but most of them have no idea how it all works and I doubt they encrypt their wallet with TrueCrypt after every transaction and copy it to five different places), they will be the ones affected by the viruses. Once virus' authors realize there is money in it, they will save no effort to get to one's wallet.

Another VERY important aspect of this is that people need to be aware of the fact that after they copy their wallet into a safe place they should start using a new one. Why? Because most people make backup copies after a new transaction (I personally do that after a big transaction). Now, if an attacker or a virus manages to transfer coins from your account - your backup copy is useless. It's actually better if the virus corrupts your wallet instead of using it (if you have a backup). And, since the wallet is not encrypted, I suppose this is not impossible? Please correct me if I am wrong.