These links are great resources on optics in general.
The Physics Classroom tutorial was written by Tom Henderson, a science teacher at Glenbrook South High School in Glenview, Illinois. Reading through the tutorial is great way to start learning about (or to review) physics and optics (start at "Waves").
Hyperphysics is a clever reference and self-learning tool that was developed by R. Nave at Georgia State University for high school teachers. It's a logically structured collection of screen-size "cards," with excellent illustrations and some interactive calculators. Don't be fooled by the tree-like navigation maps - there are additional write-ups that aren't shown as tree leaves. The Light and Color section covers much of optics.
News and current optics developments!
Astronomy Picture of The Day (APOD)
APOD features an image which changes daily at around midnight. Each amazing image is accompanied by links that you can follow to learn more. Last but not least, all past APOD's are available in an searchable archive, making this site a terrific resource. Visit it daily!
American Physical Society (APS)
The APS web site (aps.org) has many fascinating articles for non-specialists at http://physics.aps.org/. The above link is for recent papers there related to optics.
These sites on the history of optics are great place to start understanding that many people have been making discoveries in optics for a very long time!
Everything to do with the optics of our atmosphere, including rare optical phenomena.
Optics Picture of the Day (OPOD)
The OPOD has some really interesting pictures relating to atmospheric optics, accompanied by detailed descriptions of the picture and the phenomena present.
Lasers are fundamental to modern optics; these links will help in approaching the subject.
A good introduction to the physics of lasers, by Rami Arieli. Also has suggestions for simple experiments.
Four videos from MIT Open Courseware. Note that the description of the first video actually pertains to a separate video on fiber optics.
(Almost) anything you'd ever want to know about real-world lasers. By Sam Goldwasser, an LTC mentor.
These experiments were originally described in a booklet put out by the Metrologic Company. Now part of Laser FAQ.
Laser Safety is a complex topic, but this Wikipedia article is a good place to start.
Everything to do with the viewing of small objects!
American Physical Society (APS)
Atomic and Molecular Physics (AMO) group at Stony Brook University
Stony Brook University Department of Physics and Astronomy