After some months of work, I successfully ported Mono 3.0.3 on my QNAP TS-559 Pro NAS.
This is an x86 (32 bits) package, so it can be installed on others NAS.
It's based on the work done by Adnovea (http://wiki.qnap.com/wiki/Mono).
EDIT 3 : The package is available at http://www.4shared.com/file/wYUBXsY4/Mono_303_x86.html
This Mono QNAP Package provides :
- - Mono 3.0.3
- mod_mono 2.10
- XSP 3.0 (From GIT ...