You can now download fixes for the Excel bug that was in all the media a few weeks ago. The bug showed an incorrect answer in calculations, presenting 100,000 instead of 65,535. Microsoft published a couple of fixes for Excel en the Excel Services. In the end the fixes are planned to be added to Office SP1. The releasedate for SP1 is not yet available but here are the files you need to fix the bug.

Excel 2007:
http://download.microsoft.com/download/6/1/3/61343075-aa12-4152-a761-fccc16d6cef4/office-kb943075-fullfile-x86-glb.exe

64-bit Excel Services 2007:
http://download.microsoft.com/download/c/d/c/cdcccd84-86cd-4199-b01c-1df2dac66534/office-kb943076-fullfile-x64-glb.exe

32-bit Excel Services 2007:
http://download.microsoft.com/download/c/d/c/cdcccd84-86cd-4199-b01c-1df2dac66534/office-kb943076-fullfile-x86-glb.exe

KB Articles:

Excel 2007: http://support.microsoft.com/default.aspx/kb/943075/
Excel Services 2007: http://support.microsoft.com/default.aspx/kb/943076