Just read a post at Logu's blog on how implementation of standards across browsers has helped a hacking idea that was lingering for past couple of years (from 2002) is now implemented practically. This is about a security threat posed by the implementation of a standard called IDN(Internationalized Domain Names) by browsers. All URL's are vulnerable especially when accessed thru Mozilla-based browsers, Safari, Opera and Omniweb. This is basically a URL-spoofing thing, but the good part is Internet Explorer is free from this vulnerability, just because it has not yet implemented this IDN.
For more read HOMOGRAPH ATTACKS.