There are some sexing videos floating around. If you search the forums, you'll find it.

I'm totally guessing at what my Swedes are. Spot has been the most talkative all along. Raspberry is on the quiet side with barely a raspy "peep" to his voice. I've read here that, in many cases, you can tell by their voices. I have also read that in Swedish Blues, the drakes tend to have a darker or black head and a white bib whereas the ducks or hens have lighter heads than the males. Raspberry's head is really black. Spot's is dark gray like the rest of her. Plus, Raspberry has that mottled bib that Spot doesn't seem to have much of (she just has 2 little spots in her chest). So, based on all of that, I'm guessing that my Raspberry is a drake and Spot is a duck. Note: I couldn't tell the true color of their heads until just this past week when their downy feathers finally fell out of their heads.