Here's an interesting blog post about the latest in Trojan technology that is specifically targeting internet banking. You'll find the post here :
If you take the time to read it you'll shudder at the sophistication of the thing. It can manipulate DNS entries, HTML code, track cookies and more. Nasty, nasty to say the least.
It shows how much effort the bad guys are investing to getting your banking details. Why? Simple, that's where the cash is - they are a business after all.