To add to some of the Google usability tips and tricks we've mentioned previously:

Using the "Movie" keyword

• Showing 100 results
• Disabling personalisation
• Excluding supplemental results

Here's another quick one - "Define".  

You can use Google as an easy dictionary or encylopedia/wikipedia with this keyword.  Simply place "define:" in front of something that you want to know the definition to or want to understand better:

define:search

define:optimisation

define:seo

Have fun with that - there's more to come from the team - I'm sure.