14 DAY TRIAL // eBay is one famous site, that's for sure. And being high-profile as it is and also containing a large amount of personal and financial data it is only a natural thing that it has been attacked by hackers. I don't know if you've noticed, but small sites rarely suffer from hacks. Sure, some get a little DoS once in a while, but the big web pages are the ones that suffer the most.
In any case, eBay has recently been hit by hackers that have striven really hard to phish some data. This is a huge attack, it's not just one hacker meddling with the site, it's a whole botnet. That means a whole network of infected computers is being used to "break through the gates" and enter the data bank. The site is holding on as much as it can and it has not taken any damage, nor did it have any downtime yet. The malicious users just keep trying to get info out of eBay for more than a week now and they're using really sophisticated methods, attacking from many sites.
I've seen on eWeek an explanation about the hack-tactic. It's something huge, that you can't really comprehend that easily. But basically, when you will navigate to eBay, it will take you to a certain site where you will get an infection that will make you go to another page that will give you another infection and so on and so forth, it's like you would get a virus in rates. I don't know how AV's act about this, but it is a bit mind boggling. In any case, when you reach the last stage you finally get to eBay and when you log in you get your data phished. This is quite complex, so if you want to read more about it, you may visit this site.