A9

Amazon's A9 search engine, now redesigned.

Google Guide to Searching

Google Guide - Making Searching Even Easier. "Google Guide is an online interactive tutorial and reference for experienced users, novices, and everyone in between. I developed Google Guide because I wanted more information about Google's capabilties, features, and services than I found on Google's website. --Nancy Blachman"

Google Cheat Sheet

Google Advanced Operators