Here's an interesting bit of software that I found that is said to work on mobile phones. I have not tried it, but I'm very interested in hearing from anyone who has tried it!
MadHouse - Darts Scoring SystemUtilise the convenience of a mobile phone to keep score of your favourite darts games in real time.
For Mobile Phones
This application provides scoreboards for a wide range of darts variations, most of which would be difficult to play in your local games room. NO CHALK REQUIRED! 3inabed darts website.