NastyHabit: background-position-x pain!
Internet Explorer 6 & 7 likes 'background-position-x/y'
If you like using jQuery or other javascript libraries, or live dangerously and work with the devil himself, then beware of the following caveat:
CSS values retrieved using jQuery
You should see a nice pattern in the block above.
Internet explorer users, you will notice the 'background-position-x' and 'background-position-y' css rules with the correct value and the 'background-position' rule as 'undefined'. Poor souls.