I suspect that this will not be the end of accounts being hacked. Seeing as the hacker targeted specifically for bitcoins (changing btcguild and mtgox passwords), This is done by someone within the community. I only got a new SSD with a fresh install of windows 2 weeks ago, and since then the programs that I've downloaded are the miners, bitcoin client, and the various sites I've visited are all bitcoin-related, such as http://www.bitcoinwatch.com, http://blog.bitcoinwatch.com/ and http://bitcoincharts.com/markets/

I'm using Microsoft Essentials as my anti-virus, and I have not been going to suspicious sites (as far I'm aware). So the hacker could only get through to me through the above means. I urge everyone that visits the same sites or uses the same programs as I do, change their passwords regularly (and avoid using same username and email for sensitive info).

I'm just enabled the two-step verification process for my gmail account to require a verification code sent to my phone before I can log in - I hope doing so will prevent hackers to have access to my email which then they use to change my passwords for various sites. Those of you that have invested significantly in mtgox should do the same.