I have a raised flower garden (about 8 x 8) and about 2 feet deep.   It hasn't produced well, so I've added organic materials this fall and worked all of those in.  It is now in great condition as far as "food" for the soil.  Since the soil hasn't had earth worms that I have noticed in a long time, I'm wondering if now (fall) would be a good time to add earth worms to that raised garden or if I should wait til spring.

I don't think that it will matter. If it gets too cold, they'll just go deeper into the soil below your bed. And they might not come back. Hard to keep them confined unless the bed is self contained.

I know folks keeep saying if you till, that will kill the worms and they'll stay away. But I till with a tractor, and when I dug sweetpotatoes last month, I found plenty of worms. I think it depends on soil condition and food potential within.

I'd suspect that the old saying... If you build it, they will come... applies here.

You might also consider having a soil test. That will help you determine the state of your soil and they will recommend a number of solutions to help rectify it. They should be able to offer both organic and traditional depending on your preference.

i just throw egg shells and coffee grinds in the garden all winter long, our properties are so close, I'd be a nuisance to the neighbors with smelly stuff, and one neighbor suggested using dog feces to compost..NO WAY!!!  I never heard that from anyone and too much of a job to actually work it.  I don't have a dog anyway!

Actually you should not use dog feces in your garden or compost piles because of the danger of diseases. Fall is also not a good time to add worms, they will burrow deeper into the ground during the winter to stay warm, but will come to the surface in the warmth and if the ground is moist.