Thanks!
I did wonder whether it might be better to adjust the class heirarchy a bit, and have a core DSRTC class, with two subclasses (DS1388 and DS1307) etc to improve code re-use.
One problem I've found with some libraries like the DS1307 is that it isn't maintained in simply one place. I wonder if the arduino 'core' project team has considered adopting it like the I2C libraries etc? If so, it'd be clear who owned it, and therefore who to submit patches to.
Any thoughts ? 