Another engineer showed me this: cut it in squares. A few folks get the round edges, but
everyone gets a nice piece, rather than trying to cut even wedges from a circle over and over again because the center just gets messy. Necessary only if there are a lot of folks/slices (I'm talking more than 12).
Cold cake, sharp knife, tall container filled with hot water, towel that you don't mind getting dirty. Dip, wipe, cut, place on flattened aluminum cupcake wrapper, repeat.
PS: I finally bought a square springform pan. Love it just for this reason.