The one I hadn't taken was from the BBC. It's a Flash program, and intended for folks in the UK. The British cultural stuff didn't throw me, though. I rated at 141 on that test, with only two misses (out of 12) in language and one out of 12 in perception. I got perfect scores in memory, logic, and numbers, which are my usual strong points.
The one I had taken before was at emode.com. Safari hid the popups for me, thankfully. I rated at 136 on that test, and it said that I'm a Visionary Philosopher, equally good at mathematical and verbal tasks, and learn best through experience. I didn't sign up for the full report, though.