Well... I've never heard of a flatbone or featherbone, so I Googled and came up with this...
http://www.ribman.com/abtribs.html I've never seen them to know what they look like (how much meat, fat, etc.), but I would cook them just like ribs... Depending on how much meat, etc., thay might cook a little faster, but I don't know...
Take a look at Smokin's Pork Ribs 101
http://www.cookshackamerica.com/porkribs101.aspx That will give you a good starting point.