Remember Brett Terpstra’s Total Numbers service from last week? Good, because now it’s available in and even more useful and labor-free form as a PopClip Extension.

Now all you need to do is highlight a bunch of numbers with the mouse, and the new “Sum” extension will add them all up for you.

PopClip brings cute iOS-style select-and-click text tools to your Mac. It’s great.

Last week, we published a video how-to that demonstrated a number of simple ways you can make Mac OS X look and act more like iOS. To be added to that list is an awesome new utility from Pilotmoon that makes the copy & paste function on your Mac look just like the copy & paste function on your iPhone, iPod touch, and iPad.