Yeap, having it in linux could make things pretty interesting and can be further expanded to grab sites and convert to plucker format or even pdf directly.
Laurens, you prob know and are using it already, php has some built-in libraries for pdf support
http://www.php.net/manual/en/ref.pdf.php
Alexander Turcic, I code in C/C++ natively but picked up php three years back and with the flexibility of php, it should port over nicely. Granted, if the current sunrise uses specific windows apis, then it may not be a simple port but may require other apis to be written. Maybe its time to take a look at porting sunrise to php ... or maybe just get perl based plucker ported to php?