I stumbled upon the following just today:
57 Useful Google Tools for Scholars, Students, and Hobbyists

A few highlights (go to the blog post for click-thru links):

Picasa. This Google program makes it easy to manage your photos online and off. Users can download a photo editing and management program to their desktops which makes it easy to mail, upload or post photos to a blog or they can use the online albums provided by the program.

Desktop. Make it easy to find everything on your desktop with this application from Google. It allows users to search through their email, computer files, music, photos, chats, and web history to find what they need and also allows them to install useful gadgets to their desktops.

Page Creator. This program from Google allows users to design and build webpages and then publish them to sites hosted by Google. Users are offered 100 MB of storage and the program comes with a variety of preloaded templates and layouts.

Sites. Create and collaborate on shared websites with this tool from Google. Users can create a simple webpage, collect relevant information and choose who can edit and work on the project with them.

Talk. You may have heard of Google Talk but did you know that it’s not only a chat tool but can be used for VoIP conversations as well? Users can make the most of the service, and enjoy its integration into their Gmail accounts.

Trends. Get easy to read graphs of Web trends over time with this tool. It allows users to track searches over city, region or country to see when certain topics were of more interest to browsers. Users can also take a look at Hot Trends which displays the most popular searches over the past hour.

Cookin' With Google. Have some random ingredients in the fridge but aren’t sure what to make with them? Maybe this Google-based tool can help. Enter in a few ingredients and it will give you recipes in several different categories.