If you are getting killed on foursquare by your jet-setting friends, here is a hack to cheat your way into the leader board - Just use the browser to log into the mobile foursquare site here and check in wherever you want.
You won't earn badges this way but will earn points. Now you know never to believe my check ins.
And if you (like me) direct your check-ins to twitter, do visit pleaserobme.com too (thanks @stilly41 for this nugget).
Have fun, you have been liberated!