I found this cool Berlin subway map for iPhone/iPod Touch that Randy Reddig made. It was inspired by an NYC subway map by Khoi Vinh, and in turn inspired me to make one for SL's tunnelbana (metro/subway), lokalbanor (local train), and pendeltåg (commuter train) map of Stockholm. Download it here, unzip, and take a look at the readme.txt file to see how to put it on your iPod or iPhone.
I'd like to make one of these for SL's bus system too, but have not yet found a suitable map to chop up. The best Stockholm city bus map I've found doesn't have night busses on it. Most of the time when I'm taking the bus it's only because the t-bana is closed for the night, so having the night bus routes would be really useful!