PCF8563 RTC, is the Phillips RTC with 1 alarm/interrupt, battery backing and calendar functions. I wrote this lib earlier this year to test the chip.
Someone asked for it so I posted it.
Its got a few more issues to iron out but should be usable.
http://www.arduino.cc/playground/Main/RTC-PCF8563
I will finish out the page as soon as possible.
Thanks,
Joe