Well, you might wanna check out the links at DigitalTruth.com
. They link to several sites with different info, including sites regarding scanning.
But I don't know of many places that will give you all the detailed information you're looking for without paying for it... That's why I'd get thee to a bookstore and get some books you can keep and carry with you. When the manual isn't enough, there are these Magic Lantern Guides (I've got one for my Nikon N75) that I've found helpful. Sorry, I know it's not much, but maybe it's a start? I also found this book called Mastering Digital Scanning with Slides, Film, and Transparencies
too, but from the reviews they have there, it may not be what you're looking for.
As far as scanners go, maybe I can help, since the Epson scanner you have is just two models above mine (mine's a Perfection 2450), and I have a Nikon film scanner too (which one do you have? Mine's a Super Coolscan 9000ED -- just got it yesterday
). I haven't had problems with mine (other than the physical limitations of the scanner itself -- the Epson, which is why I got the Nikon). Don't know how much help I can give, but I can sure try.