In August 2003, Blaster worm outbreak disrupted bank systems as well as air and train traffic.
This seems to be happening all over again. According to the sources quoted below, there have been Sasser-related problems in at least three large banks. RailCorp rail traffic was halted in Australia on Saturday, leaving 300,000 travellers stranded - CEO of the company is quoted saying a virus might be the reason. Also, according to several sources, Delta Airlines had their planes grounded in USA on Saturday for several hours, because of a "computer glitch"...but this case has not been confirmed to be related to Sasser.