Google personalized search is now available. Here is a quick overview from SearchEngineWatch. At first glance this seems like a useful functionality for those who search a lot. Google is embracing the 'tagging' concept for future searches and also has some enhanced bookmark features. They are embracing features provided by other social networking sites; del.icio.us, shadows, etc.

Read the SEW article carefully. The benefits of this service involve keeping a record of your search activities. Make sure you are comfortable with that before you sign up.