Today Google is more than just BackRub, it's behind nearly everything we do online (And even offline!), be it Searching, Mailing, Blogging, Social Networking...
Anyway here are the 3 Google services I like the most (Apart from Google itself!) and have posted about. Do check the posts if you still haven't!! :)
Google Chrome: All you wanted to know about Google Chrome (And more!)
Google Reader: Feed me, Google Reader!