I generally am very secure when it comes to using computers and other technology, I have a virus scanner running constantly, and scan my whole computer often. Aside from that, I'm generally intelligent enough to avoid common trojan/virus traps on the internet. I also use separate passwords for everything I do, aside from one thing...
I realized that my old PSN password was the same as my Gmail password was. I changed my PSN password when the whole compromise deal went down, but didn't realize that my password for my e-mail was the same (I'm always logged in on my personal computer/phone, so I never needed to enter it).
Incidentally the attacker was from Seoul in South Korea. I've looked around a bit and have found no way to report the attack to Google, or whoever I should report such an incident to. If anybody has any information on how/where to report such an incident it would be greatly appreciated.
Finally, if you have a PSN account, and don't have 2-step verification enabled on your Gmail account/share any passwords, get on fixing that. I had nothing of importance in my account and most of my other accounts/information seemed safe. You may not be so lucky.