If you are doing some sort of comparison conditional, where one operand of that conditional is a literal, it's actually better to list the literal operand first:
if ( "someString" == someVar )
if ( 3 == myNum )
Why? Because if you mistype the equality operator (==) and instead type the assignment operator (=) -- a fairly common typo, then you will discover this error at runtime. Tracking down the cause of these errors can be difficult, but switch the order of your operands and the mistake of assigning a variable to a literal error instantly and give a useful line-number (even in IE!)
If you have any cool tips please post 'em here.