Whatza Culvers?  
I drove by this place as it was being built; didn't know what it was, but "butterburger" and "frozen yogurt" caught my eye..... so I decided to visit it on 2011-05-30 (dine-in).  Looks like it just opened, and it was busy.
Turns out this place is a fast-food chain based out of Wisconsin that I had never heard of before... kind of like a cross between an In-and-Out and a Dairy Queen.  Menu is a bit daunting the first time - a burger or a sandwich?  what side?  smoothies, or regular drinks?  You walk up to the counter, place your order, take your number to your table, and they deliver your order to your table when it's ready.
The burger patties are different... they're about 1/8" thick and seem pressed/fried.  The buns are nice and soft... ingredients are fresh or properly cooked.  Flavors are there... but it is a different style burger than what we're used to seeing.  I tried the cheese curds; just wish they hadn't breaded/deep-fried them.  I like my curds natural.  A fountain drink completes the "value basket" deal.
Their frozen yogurt or "concrete mix" sealed the deal.... we tried the banana split (nice) and their "brownie cookie dough".  Kinda hard to screw up frozen yogurt!  yum! 
Okay, so I now know what a Culvers is.  It's a good change-of-pace from the other fast food chains.  Not sure I'd go out of my way just to come here (unless I'm really in the mood for it).   I'll have to try other items, but for now, its a 3 star rating.