hi!
the fpc-xon is advancing quite well and its'very promising - the json part in 99% ready but i need more tests - if someone is interested in fast json parsing the project can be downloaded at
https://github.com/blestan/fpc-xon.
now im working on the binary serialization
xml part is planed for later this month
and pdf and mongo for the end of the year.
regards
Blestan