Weekly profiles of significant molecules, with the structures, CAS Registry Numbers (so you can look them up on other databases and websites), and some basic information about that substance. An A-Z list of previous MOTWs goes back to 2005.
An infographic series highlighting the chemistry in our lives. Recent topics include: glue, poisonous frogs, spiderwebs, broccoli, air conditioning, ice cores), plus a "This Week in Chemistry" series.
While you'll likely use Wikipedia to search for information about your compound, you can also browse compounds by category (in this case, by their uses).