Unofficial Google Advanced Search Tips
(via reddit)

Skip past the code info (unless of course that stuff is meaningful for you), and you'll find some handy tips on getting Google to do some pretty neat stuff:

I liked:

• Basic Operators
• ~ Similar Words
• Advanced Google Operators
• filetype: File Types
• site: Restrict To Site
• cache: Google Cache
• weather: Weather Forcast
• music: Music Search
• movie: Movie Search
• Flight Information
• SEO-Oriented Operators (yeah, I know - but that's the heading)
• allintitle: All Words In Title
• intitle: Word In Title
• allintext: All Words In Text
• allinurl: All Words In URL
• inurl: Word in URL

Although it looks like it, I haven't really reproduced all of the tips. Examples are given, so that you know how to structure a search.