Check out this guidebook;
"Norway - The whitewater Guide"
Written by Jens Klatt and Olaf Obsommer.
ISBN: 3-9809315-4-4
You can find it here:
www.outdoorcenter.de/product_info.php?cP..._188&products_id=962
Or here:
www.striestrommer.no/product_info.php?products_id=276
It's only for Norway, but you can kayak for three weeks here and don't do the same river twice.
I know there is a guidebook covering more of the rivers in Norway coming out. Hopefully before the summer.
When are you coming to Scandiavia? I might have some more tips about where to go. (waterlevels and so on...)
And if you haven't read Adrian Tregonings articles about his trip to Sweden and Norway last summer, I recommend that you do

You can find them here;
adrian.playak.com/index.php?option=com_c...ection&id=5&Itemid=6
There is also some articles about Norway and Sweden here;
www.ukriversguidebook.co.uk/articles.htm
And a Norwegian guide here:
www.sunnmore-padleguide.tk
And an english guide here about the rivers around Oppdal;
www.oppdalkajakklubb.no/index.php?page=Guide_English
Hope you can use some of this info