iGoogle, previously known as Google's personalized homepage, offers two options to backup your gadgets and feeds at the bottom of the settings page.
There's an option to backup the iGoogle page on Google's servers. While this may seem pointless, it's useful to backup your page before adding gadgets that might create problems.
The second option is to download an XML file that includes all the tabs, layouts and themes, the feeds, gadgets and their settings. The XML file can be imported in any iGoogle page, so this is a good way to migrate the page to a different Google account. You can also download the XML file to change the settings in a text editor and then upload the new version.