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And from the tweet on the desktop, you can see that indeed it displays in the vicinity of Green Park - but my followers who see this in their Twitter stream can pop it open to the right hand side, and zoom right in on my location. You can see this tweet here, and for those who know New York, I bet you can probably guess where I am spoofing in this tweet here - when I was demonstrating this to my colleague Mary Jo Foley.
Please read the disclaimer! You can find this and more, including the explanation - as well as the pro's and con's of using spoofed geolocation on the ZDNet iGeneration blog.