Yep SJW is the San Juan Worm, always have at least one tied on my line.
My favorite colors are copper and red and sometimes orange, sometimes i will mix them so half is copper and other half is red. Other colors dont work NEARLY as good as those so i dont even have them in my fly box.
Here is a pic of the copper one(made out of copper wire you can pick up at any fishing store or anywhere that carrys wire really)
And here is a red one(i use liquid lace)
Here is a guy that gets me alot of fish(with the fly pattern of course) the stonefly