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A Google Web Search Help thread tells us how to change the iGoogle layout from the new tabs along the left-side of the page to the old style of tabs across the top of the page.
To bring back the old top tabs, just go to google.com/ig?hl=all. In the past, bring up the old top tabs worked by going to google.com/ig?gl=all but now google.com/ig?hl=all is how to get there.
Here is a picture of the old tabs:
Here is a picture of the new tabs:
Forum discussion at Google Web Search Help.
