If you want to remove Google’s newly added Chat Box into iGoogle, here’s a workaround that disables it. If you haven't set up mobile iGoogle, use the wizard from this page. Then go to the settings page, scroll down to the Export/Import section, click on the Export button and save an XML file that contains the settings for all the iGoogle tabs. Open the file in a text editor like Notepad, find the last line that contains <Section/> and remove it. After saving the file, go back to iGoogle's settings page and upload the XML file.
Source:→ Google System