iGoogle has a feature which lets you customize the layout of the tab. Whether this is new feature or a hidden one is not clear, myself i never noticed it.
There are 7 layouts available so far,
1. 1 column
2. 2 column (3 types)
3. 3 column (2 types)
4. 4 column
To change the layout of the tab click on the small arrow beside the tab title and select the layout for that tab. Changing one tab layout doesn’t change the layout of other tabs.

[Via Google Operating System]

Nice thing by google, i was personally bored by the 3 colomn look . Nice thing that we can change it.
@Viabhav
Yes the default layout is boring, now we have more choices
Frankly I dont use iGoogle often, any ways good to know that its having better layout.
I’m also not a fan of iGoogle, my vote is for netvibes
@Shankar
Netvibes is also a good one, but i am using iGoogle
Sadly, I am using both NetVibes and IGoogle
But I am slowly turning over to IGoogle as they add new features like this. It is still easier to make your home page look better with NetVibes but IGoogle is catching up when they add stuff like this… Thanks for the heads up!
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