I prefer regular 1. Google Search 2. Webmaster Tool 3. PR checker 4. Adword 5. Analytic Tool 6. Gmail.
I love to use google maps it really is a big help when you're going to a place that you're nor familiar to.
Google has provided different kinds of services to the users, and we cant imagine the wide range of facilities available for the registered users. most common form of services used by me are Google talk, Google maps, Gmail, Google toolbar, Google search engine, Google Pagerank tool.
I do agree.. these are very relevant tools. Google search, the most in-demand search engine of today.
I use following Google services: G-mail Google analytics Google ad-sense G-talk Blogger Web-master tool