Linux: If you're using GNOME-Do and not using the up-to-date repository for the app launcher, you really should be. That's where you'll find goodies like the newest "Docklets", helpful widgets that respond to both clicks and text commands.
You have to be using the Docky theme to take advantage of the handful of test docklets included in the latest Do release, but they're worth it for laptop battery fiends, CPU obsessives, weather watchers, and others in need of ambient information. Head to the Plugins section of GNOME Do's preferences, then select Show: Docklets. Check the docklets you'd like to play with there, then head to the Appearance tab and enable them there.
The weather docklet, in particular, can be really helpful, even if you don't keep the actual widget showing but simply enabled. Hit your trigger keys (Windows key + Space by default), then type "Friday's forecast", "Radar Map" or "Reload Weather Data" to open Weather Underground in a new browser tab, or just click on the docklet to see a full week's worth of weather. You can track the weather in multiple locations, too, and switch between weather providers, as explained at the docklet's wiki page.
GNOME-Do is a free download for Linux systems only. Tell us what you think of the new docklets, or what else the app launcher should be focusing on, in the comments.