The best Chrome extensions, according to the Google Chrome team
Readability: Great for removing ads and extra cruft from articles, paring them down to highly-readable text.
Turn Off The Lights: Darkens video pages to highlight the video you're watching. Works on YouTube and many other video sites.
After The Deadline: The ultimate spelling and grammar checker, brought to you by Automattic, the company behind WordPress.
There are more where those came from, to pump up your browsing experience. I'll say this for Google: they have great taste in extensions for their own browser. It's nice to see them encouraging their developer community, too.