An interesting point is that for receiving coins and for long-term storage, bitcoin wallets do not need to be online, and in fact do not need to ever have touched a machine that has been online. While slush "just" lost his "hot wallet", another user lost 200k. When will it become common best practice to store high-value accounts entirely off computers? You can print out a bitcoin wallet and put it in a safe deposit box for storage, and still add money to it.