I googled suspension hub and found the Pantour, looks pretty hokey and trouble waiting to happen.
I'm also thinking big fat tires on a cruiser style bike should be enough for a smoooth ride. I've seen some with the springer type front suspension but have never used one personally, don't know how functional they are. I wouldn't bother with a suspension seatpost, they're just annoying; a big old spring saddle should work fine if that's something you want.
Anthonyg--There are a lot of good suspension forks out there, have several, although can't say I've seen one on a beach cruiser (as most of those forks would cost more than most beach cruisers).