Arbor Networks Inc

The Internet is a little less jammed with spam after a cybercrime group blew the whistle on one of the biggest offenders. HostExploit, an alliance of volunteers who work at Google, McAfee and Arbor Networks, has been tracking and documenting cybercrime activity and its latest effort slashed worldwide spam by 50 percent and junk e-mail by 75 percent.

Attackers bent on shutting down large Web sites -- even the operators that run the backbone of the Internet -- are arming themselves with what are effectively vast digital fire hoses capable of overwhelming the world's largest networks, according to a new report on online security.

In these attacks, computer networks are hijacked to form so-called botnets that spray random packets of data in huge streams over the Internet. The deluge of data is meant to bring down Web sites and entire corporate networks.