A thing to remember when working and converting images to black and white is to adjust blackness. Contrast is the base in a gray scale photo, but only adjusting the Contrast setting in post processing will get those whites burn out. By adjusting Blacks you will just correct the dark end of the histogram to even darker. wich will make the contrast between gray and black much better. How to adjust is of course a sense of taste. I prefer subtle whites, hard grays and hard blacks.
Those stubborn out there who shoot in-camera B/W. I don't think you're stupid anymore, since I discovered recently that atlest Sonys Raw format stores the RGB information in the image, and Picasa automaticly turns it to color again when loading. Nice feature if you like to see the B/W result right away.