Slashdot points to an article in The Register that refers to PWC and KPMG reports on this issue. The article suggests that it could cost corporate America losses in excess of $10 billion annually.

If your business uses spreadsheets for critical or material information, they should be looked at carefully both from the perspective of accuracy, and access control.

Read the Slashdot post
Read The Register article
Read an earlier post I made on the topic