I’ve been using xScope for a while now, and I highly recommend it for everyone pushing around pixels, divs and whatnot. Its rulers and the loupe have become invaluable for me.
The recent upgrade to 2.0 (current is 2.1) introduced a neat new feature which quickly measures the dimensions of anything under the cursor. It’ll find the next border in every direction and give you nice and easy measurements.
Of course that’s far from being all it does. Go check it out. It’s a neat little gem. Available from the IconFactory.
In other news, I finally decided to go on the Twitters.