GoogleGuide has a great advanced operator guide that showed me a few items I was unaware of that are available through GG's search bar. In addition to being comprehensive, it's also highly readable and easy to follow, which I appreciate. In fact, the entire Google Guide site is a great resource for those interested more in the search side of things than the optimization side.

If this type of education ever takes hold with the general searching public and folks become as proficient with the Internet and search engines as they have become with telephones (speed dial, re-dial, *69, etc.), the optimizers among us will have a whole new world to deal with and a "long tail" that's hundreds of times its current size.