Hello! I'm Paul Hammond, and I made Minimuni in 2008 so I didn't have to rush to catch the San Francisco Muni in the morning.
If you live exactly 2 minutes from Sunset Tunnel East Portal, 4 minutes from Duboce and Church, and 6 minutes from Church Station you may find it useful too. I'm sorry it's not very helpful for people that live somewhere else.
I wrote more about how and why I made this thing on my website.
Minimuni is hosted by Google App Engine and the source code is on GitHub.