Variable fillets are cool.
It's a little hard to tell, but I'm filleting an edge on the interior of the part here. Because of the particular geometry, I really want the fillet to be big in the middle and small on the sides, so I define multiple points on the edge and tell Inventor to blend fillet radii along the edge.
It's worth noting that all of this is some decidedly 21st century shit. Which I think is cool.