The iPhone interface has a public URL: http://google.com/ig/i, but iPhone users will be automatically redirected to this URL.
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The standard mobile version of iGoogle available at http://google.com/m is much more limited: it only displays feeds and a very small number of gadgets, you need to manually add items to your page and you can't change the number of items displayed from a feed. Another limitation is that it only works in the US.
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{ via Blogoscoped Forum. The image doesn't show a real iPhone. }