I wasn't following the wich list or this thread closely, but it appears that something missed in the wishlist was "Glow". I'd like to have materials that emit light of their own, like lasers and neon signs. It's not the easiest effect to fake in Bryce now, and the last time I tried it increased render time almost ten fold. I don't mind the rendertime increase as much as the work it took to fake the glow. :)