By far the easiest way to switch between google.com and google.co.uk is to drag this button to your browser’s bookmark bar. The next time you’re using Google, click on it when you want to switch domains. Simple!

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1. norz 14 July 2009 @ 12pm

   Thanks for the bookmarklet!
   NB: there's an error in it: the operator should be >, not <, otherwise nothing gets replaced.
   Google Switch

   I changed it slightly to use the 'hl' parameter, this works better imho to switch from the international version to the French version:
   Google Switch
2. Neil Cowburn 14 July 2009 @ 10pm

   Thanks. I've updated the typo in the code.