I love this weather app. It is accurate, light on resource drain, is lightning fast, and shows current temp in your toolbar as it's widget/icon. Even cooler? The app tracks your location, so the forecast is for where you currently are.
My ONLY con with this one is the precipitation is sometimes not as locally accurate... but its forecasting percentage of the area, not the likelihood of the rain where you are now.
But a huge amount of data is given when mouse selected, and the return data is almost instantaneous.
Months later, and the only negative I have is that it is necessary to manually refresh via the temperature icon on the browser bar if you have exited and restarted your browser.