Yes!!! It does work. I'm affected by it every year around February. A good friend of mine is also affected by it and bought one of the lamps and keeps it in her office and she says it helps ALOT!!!!
I'm looking into getting one of the lamps this year. I'm thinking I can probably get one on ebay for alot less than retail too.
Here is some more info:
This site has a lot of really good info on SAD itself:
http://www.lighttherapyproducts.com/sadinfo.html
Here is one that has some products:
http://www.fullspectrumsolutions.com/
Hope this helps.
XW of the "needs the Sun" class