Via Political Animal, here are a few tests to check whether you are left-handed or not.
I got the following expected results on the Edinburgh Handedness Inventory.
Using the rating method of Oldfield, Laterality quotients range from 100 (right handed) to -100 (left handed)
This subject’s laterality quotient is: -50.0
Placing this subject in the 2d left decile.
There are a number of tests at World of Handedness to check if you are left-handed, left-footed, left-eyed or left-eared.
Here are some statistics about these tests.