When Mac OS X 10.5.0 came out I immediately updated and was appalled by purple iDisk icon. I changed the icon’s color to blue. This worked fine on the desktop but the Finder still showed the purple icon in its sidebar. Until now. With 10.5.8 the Finder finally picked up the new icon I assigned back then and shows it in its sidebar.
Edit: It looks like Apple changed the color of the iDisk icon to blue in this update. I assumed that Apple finally made the Finder use the correct icon. Instead they just changed the default color which incidentaly was just the color I had chosen months ago.