I use 'Setlist Maker' with my Android tablet, attached to the mic stand. I like that you can drag and drop any last minute order changes and I have little crib notes visible, too, in case I feel the need to mention who wrote the song or when. Which I do sometimes with the blues band. Or little hints like 'finish on a C'
I also print off a paper list and have it on standby, you know, just in case