OpenStreetMap
I think I have, after an hours work, created proper relations for these two counties. Couldn't get it to work in Potlatch 2, but it did work in Potlatch 1.4.
Now to clear up the duplicate nodes in Bonner County.
http://matt.dev.openstreetmap.org/dupe_nodes/?zoom=10&lat=48.18498&lon=-116.47214&layers=BT
Discussion
Comment from ToeBee on 11 April 2011 at 14:19
Looking at the relation page, it looks like you are missing a segment in the southwest corner: http://www.openstreetmap.org/browse/relation/1536525
I haven't used Potlatch (1 or 2) to do much relation editing. JOSM has a nice display to let you know if a relation is ordered/closed or not.
Keep it up! I have done county relations in 3 states now. It is hard work! :)
Comment from ToeBee on 12 April 2011 at 01:37
Also, I just noticed that you have both an admin_level=6 and admin_Level=10 on the relation. Tag keys are all lower case and there should of course only be one (6 I believe is the correct one)
And one last comment: don't take the duplicate checker as gospel. It is perfectly fine for administrative boundaries and roads to have nodes on top of each other but not connected. Joined nodes generally indicate that you can route from one way to the other or that the objects are legally or physically defined by each other. The way imports were done here in the US, boundaries and roads often have nodes where they cross even when they really shouldn't have any and rather should just pass over each other without interacting.