The concept is simple: websites get frontpaged on digg, slashdot, mixx and other content sharing sites around the web, when this happens, visitor counts fly hence causing bandwidth usage to skyrocket. This is where Flexi Banwidth comes in. Instead of (like other web hosts) cutting your website off the second you breach the limit, we'll allow you to use over your paid bandwidth allowance. This means if you happen to be slashdotted or dugg, the "digg effect" won't result in either a) mass overage charges or b) account suspension.
Yes and no. If your sites are constantly going over your bandwidth limit, we'll obviously ask you to upgrade. But, we won't suspend your account at any point.