So I've taken it upon myself to a) upgrade his script to work on all pages, not just the home page, and meld together my Twitter scripts with his moving towards (in my best deep Jerry Bruckheimer voiceover voice): The Ultimate Twitter Upgrade Script!
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I've also striped out the code that waited for the DOM to be ready - not sure why I did it in the first place, but it looks like the whole DOM is available to greasemonkey as soon as it hit the code - so it means the lat/long lookup is quicker.
For more information on my bits of the script, have a read of my initial post