I'll second 9barJoe's summary. There is a wee problem with the grey menu bars that causes a horizontal scroll bar in all screen resolutions. And the site could be run through the validation mill

.
Also [and this is a nit picker!] the average speed table is a bit confusing at first - until you have at least ten results. It is adding the total and dividing by 10. So, after my first test where I got a speed of around 300k, it gave the average as 30k. A more accurate result would be the total divided by the number of tests, which would give 300k.
Apart from the above, I like it


. Nice look, nice feel, nice features. Pity it doesnt do anything for my IBB speeds!