Caveat: These are not necessarily scientific, normed instruments. These are simply screening tools. They may help you get a sense of whether it is worth pursuing it further.
Adult ADHD Self-Report Screening Tool (ASRS) from the World Health Organization
Adult ADD Screening Examination - Version 5.0 Larry Jasper & Ivan Goldberg
ADD Consults (A list of screening tools)
The "Stroop Test" measures the ability to sort out distracting stimuli and act on the proper one. It can be an indicator of ADHD. Look here for the Stroop test and a detailed explanation of the Stroop effect.
The real test is how long you spend playing with this, when you know you have other more important things to do [grin]!
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