WeatherBug is a Vista sidebar gadget that displays live weather conditions anywhere in the world. The details include forecasts, radar, weather cameras, weather alerts etc. It has enough customizable options that let you set degrees (Fahrenheit or centigrade) you want to view the temperature in, location etc. You can set your location by searching with city, state or even zip code.
Atom/RSS News Reader
Another useful Vista gadget! Atom/RSS News Reader is a tiny feed reader that fits in the Windows sidebar, helping you to always stay in touch and updated with the latest content you care about. It supports both RSS and Atom feeds and also features stylish themes (skins). You can even import subscribed feeds from Internet Explorer 7.
RSS To Speech
It's basically a RSS feed reader but it actually reads the feeds aloud after downloading them. You can add feeds of your choice and also have the ability to control various settings like speech volume and speed, delay between feeds etc.
This Vista sidebar gadget displays live sports scores for MLB, NBA, NFL, NHL, NCAA Basketball, and NCAA Football. A must have for those sports fan who follow these games!
Fidelity Market Monitor
Fidelity Market Monitor gadget helps you keep track of the stock market. You can personalize your watch list by adding stocks, mutual funds entities you want to watch. The gadget is also capable of showing details like day high, day low, %change, historical charts, and news on a particular scrip etc.