What's Your Favorite Chrome Extension?

I know everyone is quick to say AdBlock or HoverZoom, but I'm looking for some other solid extensions to try out.

I'm split between 2 different extensions that I use on a daily basis as possibly ranking my favorite. One is ForecastFox. Basically it enables you to see the current forecast straight on the icon. You can then click on it and see the radar immediately.

The other one I'm a fan of is Musicality. It lets you have keyboard shortcuts for a bunch of online music players, like Pandora and Google Music. Also scrobbles and has some other minor features I don't use and don't care about, but worth checking out.

So what are your favorites? Which ones do you use everyday?