Edit: I wouldn't do this -- I'm having trouble switching back :)
Edit2: It's safe, it's just all in the order you open things, no permanent change.
Disclaimer - last time I did this I was locked out of my Gmail account, but so far so good. It make be a bad idea to have a regular and iPhone version open from the same IP? I dunno - scared to try.
So, create another shortcut to Chrome and add a switch to the end, making it look like this:
"C:\Documents and Settings\*Vince*\Local Settings\Application Data\Google\Chrome\Application\chrome.exe" --user-agent="Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16"
(Note: You'll need to change the "Vince" part to your profile obviously)
Once you Apply, your shortcut is done.
Open Chrome, go to Gmail (it should look just like your iPhone version), the you can "Create application shortcut..."
You'll think have a nice ugly icon shortcut icon on your desktop. (Maybe a short cut in the Quick launch bar would look better?)
Yep, sure does.
Anyway, with your shortcut, you now have a nice standalone iPhone version of Gmail, perfect for if you're running dual monitors like I am and want to keep a lot of screen space open.
This should also work nicely for any other iPhone formatted site like Twitter.
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Sorry, I had some neat screenshots, but they didn't quite come through...