CSIS in the US has produced a timeline which records significant cyber incidents since 2006. It focuses on cyber attacks on government agencies, defence and high-tech companies, or economic crimes with losses of more than a million dollars. It also provides a summary of incident in the past year.
Any modest contributions for my time and ongoing expenses are welcomed! I have a page where you can do so, and where one-off contributions start as low as $3, at
NOTE THAT THE ABOVE LINK IS NOW CORRECTED AND WORKS!