This road doesnt really lead anywhere (from Färjestaden theres only a gravel road), but some nice corners along the way, and if you want you can check out the abandoned ferry dock in Färjestaden if you like those kinds of things.
An excellent road that goes through both Södermanlands and Östergötlands län, near Nyköping. Very narrow, but great fun and some nice views over Bråviken.
This road was resurfaced in the summer of 2012, unfortunately I was there right after the resurfacing, and the road had lots of gravel in the corners. When they have removed the gravel it will be a much more pleasant road to ride.
From Stigtomta to Jönåker in Södermanland. Fast, sweeping corners and many straights, most of the road has good visibility. Good road for sports bike riding, but not the kind of road I prefer with my TDM.
This is a road where you can keep quite high speed (and higher speed makes the long, sweeping corners more interesting), it has many straight sections and is probably suitable for sports bikes. Not one of my favourites, but still a nice trip through Södermanland.