RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
Placemat - Pretty nice placeholder images.
Random Name Picker - A simple, quick online app that allows you to pick a random name from a list.
PlaceKitten - Dead-easy placeholder images. Of kittens.
Random Number Generator - Randomly generate integers or floating point numbers within a given range and specified discrete or continuous statistical probability distribution.
placeholder.pics - Lightest way to include placeholder images in your design