Reed Lauber's nextsepta.com now offers substantially the same information formerly offered by septime, plus realtime bus locations. I'm thrilled that the torch has been passed to a new generation of transit hackers! SEPTA's mobile site now offers substantially the same information (There is also SEPTA's official mobile site, but as folks have pointed out to me, it doesn't cover the same use case very well.)
Others interested in creating alternative tools for SEPTA data should check out the SEPTA developer information page, the GTFS specification, and the Transit Developers Google Group.
Also be sure to visit isepta.
With affection,