I have created a Git repository for Powerline on gitorious:
http://gitorious.org/powerline/powerlineAlso, as a side note, Powerline 0.3 "Cross Country" is finally in development. So far, most of the development has focused on bugfixes and a new interface, but at least the following features will be supported:
* Reservations: make a reservation for a computer ahead of time (while still allowing walk-in signups)
* Per-system policies: Change the allowable number of sessions and session length per system.
* SIP2: As a replacement for the currently somewhat quirky Koha plugin, there will be better integrated SIP2 support, allowing Powerline to interface with a much larger number of ILSes.
If you're a developer, feel free to take a look; though the current HEAD is not very usable, it is on its way.
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Jesse Weaver