In my shop I've got so many different types of tape—duct, gaffer's, masking, painter's, packaging, paper, conductive, electrical, et cetera—in so many different colors that I don't have the space to put them all in dispensers. Hence they all sit in a large drawer waiting to be pulled out. Which means anytime I'm using one for a project I'm constantly re-scrutinizing the roll to find out where the end of it is, or dragging my fingernail around the perimeter in low light, usually going in the wrong direction so I can't detect the lip. It's a minor annoyance, but a recurring one. (And I don't like doing the folded triangle thing because it's wasteful.)
Which is why I think these The End is in Sight electrical tape rolls from American Science & Surplus are so brilliant. A simple gray double line spirals around the entire roll, letting you see where the edge is instantly. At $3.75 for three they won't break the bank, but unfortunatly they only come in black, and only electrical tape.