wow fat, looks impressive! As soon as i get a new Micro SD card reader (dropped mine last week -.-) i'll give your code a try ... sadly that's also the reason, why i couldn't test my interrupt driven recorder ... but just hearing about your solution sounds a million times better, then using interrupts to capture data during the write process.
I'll keep a close watch on your work and will try it out, as soon as you have a working prototype 
oh - and i'd vote for JAVA as your parser code, as i'm coding my desktop pendant in Java as well ... to parse the byte Log, i had to use a simple fileInputStream, read the individual bytes and put them in a buffer of size 16, because when reading complete lines, the possibility of a byte having the value 13 (newline) was too high and i had incomplete lines.. If you like, I can give you my java parser, to check out what i did
keep up the good work!